air conditioner fan speed adjustment

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Press to turn the fan … Our new air conditioner, a Dometic Penguin II, works very well and produces a temperature differential (intake vs. cold air) of about 20 degrees. Additionally, many ECM based furnaces will offer one final adjustment for air speed and dehumidification. Another adjustment that needs to be checked regarding fan speed, especially on ECM based furnaces, is related to multistage equipment. Visit our site – www.priorityenergy.com, if you need help with ESP – as it relates to furnaces/air handlers, we’re not psychics… although I am sensing a lot of questions coming in as I write this article. For your furnace and AC to work properly, and keep humidity in check, your system first needs to be sized correctly. During Quiet operation, Heating and Cooling performance will be reduced some- what. When switched to AC mode the fan … In the past this functionality has been reserved for top of the line equipment, however we’ve heard rumors some of this functionality will be spreading to mid tier equipment as soon as late 2017/early 2018. Latent Heat is Indoor Moisture and Humidity. We call this the sensible heat ratio (SHR). First note, our furance uses a red (low), blue (med-low), orange (medium-high) and black (high) wiring configuration. Fan speed setting. Set SW2 ---2 to ON and SW1 ---5 to OFF for ---7% airflow (nominal 325 CFM/ton). But if you think your unit isn't working well, a visual inspection of your unit's filter should tell you whether it's the culprit. The real answer is, like most things, it depends. Can be noisy to have the fan running 24/7 “Auto” setting. If your furnace has a port on the furnace board next to the thermostat connection terminals labeled “dehum”, this port can be used to: For the dehumidification function to work, your system will need a thermostat/control that reads humidity and can energize this dehum port when the relative humidity exceeds the setpoint in the building. Most of these are on the bottom left of the control board. Most systems offer two fan settings: On and Auto . If we recommended a 60kBTU furnace, and a 2.5 ton air conditioner, they would frown and explain they had to put a 3 ton AC with the 60kBTU furnace or the system wouldn’t work. But modern units offer ways to … Priority Energy offers builders, architects, HVAC contractors and homeowners a variety of home performance services to optimize the performance of their homes or buildings. For our example, lets say we test the furnace while running it in cooling mode (after 10 minutes of operation) to be operating a screeching total ESP (TESP) of 0.9 iwc (not uncommon around the Chicago area, a slow death for this unit and way above the mfg recommended 0.5 iwc). Running in Energy Saver Mode: Under normal operation, the exhaust fan cycles on and off with the compressor, and the circulation fan runs at the set speed. But modern units offer ways to cool your home effectively while using less energy. Air conditioners remove both types of heat, but not equally. When we say correctly setup, for this article we’re going to focus on airflow and fan speed (because that should be set first before the charge is checked). First, putting your fan … Take a moment to familiarize yourself with the settings on your air-conditioning units. Many of today’s industry professionals will tell you AC’s need 400 CFM of airflow per ton of cooling provided. So the air conditioner was not “broken”. As a rule of thumb, check your filter before the start of the summer season and at least once a month during periods of regular use. Got pets? In our PSC example, we would likely have had to slow the fan speed by 7-15% to give us the ability to get much closer to our target of 350 CFM/ton. The evaporator coil, which is connected to your furnace/air handler, is where the refrigerant picks up heat from the house when it changes to gas, and ideally causes the air from the house to condensate as it moves over it. I can feel plenty of air 6 years college. The small air conditioner fan, portable Evaporative Air Cooler, mini table air cooler. If we do not, we can end up with the buildings we started this article with – cold and humid. Indeed, you might save a considerable amount of money by getting a Nest or … I have a goodman air handler unit aepf4260 for my split unit. I own a 2008 Mazda Tribute and the heat/air conditioning fan … ECM motors typically offer all the same speed adjustments as PSC's, with the added ability to reduce speed in smaller increments from the low, medium low, medium high and high settings. Adjusting this setting allows you to control the speed with which you can control the cooling or heating of your room. Copyright © 2020 | Priority Energy Solutions | 538 Busse Highway, Park Ridge, IL 60068 |, ASHRAE's Expert Building Preparedness Guidelines for Building Owners, Property Managers and Superintendents, Aeroseal Duct Sealant Earns Official Low VOC, LEED and ANSI/GBI Compliance Certificate, Building Owners: Utilize your HVAC System to Help Prevent COVID Spread, Clients: Your Homes and Buildings are Prepared, DIY Network's Mike Holmes Recommends Aeroseal for Home Comfort, Elmhurst, IL - Nitti Development and Priority Energy; Partners in Healthier, High Performance Home Construction, Energy Efficient Homes Tax Credit of $2000 Extended, Energy Star & Thermostat Settings - Our Concerns. PSC motors have terminals on the motors, which will allow them to run at different speeds; typically, Black = High Speed, Blue = Medium Speed, and Red = Low Speed. Which means we can and should lower our fan speed by nearly 30% from where it’s at – which will have a significant impact on total ESP. Some furnaces will let you use a different tap for heating, cooling and fan on, others will allow different speeds for heating and cooling, and some will only allow one speed for both heating/cooling. Step 3: Cold Air Check the unit for cold air; it if is not blowing cold air it may require a refrigerant recharge by a certified professional. Slow the fan speed of high and low cooling when humidity is high. lowering the fan speed of the air conditioning unit shortening the compressor and fan time having a short interval between cycles When your air conditioner is in the cooling mode, the compressor will run for longer times and will cycle off less frequently and therefore removes more water from your air … High is usually most effective for cooling during normal warm weather. Reduce the fan on time after temperature setpoints are met to minimize the amount of moisture blown back into the house from the evaporator coil. We’re going to be aiming for a fan speed for cooling of approximately 350CFM/ton x 2.5 = 875 CFM. Heating & Air Conditioning Contractor. When cooling, the fan will only run while your air conditioner … Even if you're missing the instruction manual for a unit, its controls should be self-explanatory. If you decide you need to keep your units running because of pets, don't use your timer. The Spruce uses cookies to provide you with a great user experience. From mechanical design to code compliance testing, we are here to support you. If so, you'll probably save energy using these functions. Improving the Living Conditions for our First Responders, Priority Energy Helps Chicago School Identify Easy HVAC Tweaks to Open More Safely, Priority Energy Helps Commercial Buildings Meet Air Tightness Requirements with Duct and Air Sealing - Leakage Reduced by 5,000, Priority Energy Partners with Verde to Offer Commercial Customers Better Energy Efficiency Rebates, Priority Energy Tests another Commercial Building for Novak Construction, Reducing Indoor Risk in Times of COVID-19 by Using Building Science and a Bit of Common Sense, Ventilating Dehumidifiers Help Reduce Asthma and Allergy Symptoms, WSJ Video Compiles Expert Recommendations for Ventilation and Filtration - See our Note. Set SW1 ---5 to ON and SW2 ---2 to OFF for +15% airflow (nominal 400 CFM/ton). However, we still need to compare the operating condtions (ESP) to the fan curves found in the manual. Learn how to set the fan speed and temperature on your Daikin air conditioner using the remote control. So great, problem solved, right? However you should refer to your manual, because these will vary sometimes. Adjust the fan speed to its maximum setting. Look for buttons that read "auto," "energy saver," or "smart fan," and experiment with these settings to see if the air-conditioning still meets your needs. If the room does not warm up/cool down when using QUIET Operation, please adjust the air conditioner’s Fan Speed. This setup is likely causing all sorts of problems, not the least of which is higher humidity. Still however, the most common installation is the standard thermostat that will tell these motors to turn on based on the settings at the furnace – they will more or less run at a constant output, but can ramp up/down based on load applied. Auto, low, medium and high all work. This way, your air-conditioner will stay off while you're at work but will automatically turn on during your commute at 5:15 p.m., cooling your apartment in time for your return. 20kBTU increments: Priority Energy provides training and services to HVAC contractors. All manufacturers provide the ability for the thermostat to vary heating and cooling staging and fan speed to meet temp and humidity setpoints. When it's in heating and cooling mode, the fan speed is great. If I turn the set temp up high enough the air conditioner turns off and the adjustability returns. Once the air temperature reaches the temperature on your thermostat, the fan stops moving air throughout your home. Chances are, your units have more than just an on-off switch. Set both SW1 ---5 and SW2 ---2 to ON for +7% airflow (nominal 370 CFM/ton). Just because it runs at a constant speed doesn’t mean it can’t be adjusted to run at different (but constant) speeds. Most AC’s have 4 settings for the fan… Is this normal ? The critical components of this process are the amount of refrigerant in the system (which must be matched to the outdoor unit's ability to move/compress the refrigerant) and the velocity of the air over the evaporator coil. If your furnace has a port on the furnace board next to the thermostat connection terminals labeled “dehum”, this port can be used to: Slow the fan speed … There are two types of fan motors found in furnaces: 1.) We’re exceeding the CFM’s we need by 1,235-875 = 360 CFM, and we’re running at 494 CFM/ton. By using The Spruce, you accept our, Use the Auto, Energy-Saver, or Smart Fan Function, The 8 Best Combination Fan and Heaters of 2020, Use Your Air Conditioner More Effectively, Frigidaire FFRA0511R1 Air Conditioner Review, The 8 Best Portable Air Conditioners of 2020, Friedrich Chill CP06G10B Window Air Conditioner Review, Energy-Saving Window Air Conditioners: What You Should Know, 10 Apartment Living Tricks Every Renter Can Perform, The Energy Efficiency Ratio of Room Air Conditioners, Sizing Your Air Conditioner to Save Money. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board. Set the fan speed on high, except on very humid days. For example, say you leave your apartment at 8:15 a.m. each day and get home at 5:45 p.m. Before you leave, set the timer for nine hours. Page 7 Heating: Use to warm your room. Your air conditioner's fan operates independently from the cooling unit, circulating air throughout your home. The more often it has to turn ON, the more electricity it uses. The air conditioning system switches between individual and synchronized modes each time is pressed. Don't have a timer? https://www.hunker.com/12001949/how-to-change-air-handler-fan-speed The same advice applies to heating as well. If the air is directed toward the back of the couch or into curtains, much of its cooling power is wasted. ECM motors can have the same speed taps we showed you with the PSC motors, however they often have dip switches that need to be adjusted at the board. The US Department of Energy recommends setting air-conditioning at 78 F when you are home and setting it higher when you are away from home. 40kBTU furnaces typically get 2 ton fans (800-900 CFM), 60kBTU furnaces typically get 3 ton fans (1,200-1300 CFM), 80kBTU furnaces typically get 4 ton fans (1,600-1700 CFM), 100kBTU furnaces typically get 4 or 5 ton fans (2,000+ CFM). During Heating mode: When Heating mode is selected, the air conditioner … Worse, we can end up with homes with high moisture levels which turns into mold and ultimately does catastrophic damage to our homes. Many units offer three fan settings: high, medium, and low. I have a 2008 mazda tribute - the fan speed adjustment control knob that controls the volumne of air circulated in the vehicle will not work on level 1 or 2 I have to turn it to 3 before air will start coming out. The fan speed does not adjust when the air conditioner is on . The Comfort ™ FB4C fan coil utilizes a high-efficiency, multi-speed blower motor to provide comfort options. However, when it's very humid, it's better to keep the fan on low. Finally, controls should be in place to optimize the equipment used. These fans are matched based on the size of the furnace, which are typically sold in approx. There are too many unknowns to answer this accurately. When I set the temperature back down so the air conditioner … Two stage ACs and even five stage ACs are available today; however we still need to check the fan speed of these lower stages. If you've got one or more air-conditioning units in your apartment, have you looked at the settings? Evaporative air coolers, or air coolers, use water and a fan to cool things down: The fan draws in warm air that then passes over damp pads, creating an instant cooling effect for a cost-effective pick for a room cooler. For cabin comfort, you can use SYNC 3 to adjust a variety of climate control features, including temperature, defrost controls, and fan speed. You may notice that there is less even distribution of hot or cool air. Because of this we have worked with thousands of HVAC contractors over the years. So, to check and set speed on an ECM based furnace you would need to check the TESP in cooling mode, and then refer to the manual. In the fan curves, for a 60kBTU furnace, in high (black) running at 0.9 iwc; this blower motor should be delivering 1,235 CFM. SHRs are typically 70-80% sensible heat removal to 20-30% latent removal. When it's hot outside, there's nothing better than returning home to an apartment that's well air-conditioned. This was in large part because they didn’t know how to adjust the fan speed on the units. This allows the evaporator coil to maximize the removal of water from the air in your home because it is operating at a temperature below dewpoint… meaning the coil is sufficiently cold to cause the air from the house to condense allowing the water to drain out of the house. To adjust the fan speed, press "" on to increase the fan speed and "" to decrease the fan speed. Our contact with a large majority of HVAC contractors has helped us to learn that most of them: The HVAC contractors we know couldn’t explain why, but they knew if they put a 3 ton AC with a 60kBTU furnace they would have less problems then if they put a 2 or 2.5 ton AC with that same furnace. The fan which blows the air over the evaporator coil from the house, and pushes the cooled air into the home. You may be thinking, “The more often my air conditioner runs, the more energy it will consume and the higher my utility bills will be.” But according to a study by the Department of Energy, “Operating fan motors or compressors at lower speeds for longer periods of time can lead to reduced total energy consumption.”1 This is why air conditioners or heat pumps with compressors that … Humid climates need closer to 350 CFM/ton or less, while dry climates work just fine with 400 CFM/ton. Don't sweat it. They will turn on, ramp up slowly, and can even be set to run at infinitely different speeds depending on load and need at the thermostat/control. We’re going to focus on how well the speed of the fan in the air handler or furnace is matched to the AC. Finally, there is an easier way to automate all of this, which involves utilizing the manufacturer's communicating modulating/variable speed equipment (modulating furnaces and staged/variable speed ACs/Heatpumps). We can guess before looking at the manual, since this is a 60kBTU furnace and likely has a 3 ton blower motor in it, that it’s most likely not set correctly since the high speed terminal is being used for cooling. Instead, consider raising the temperature setting and lowering the fan settings a bit, as appropriate, to save money while still accommodating your pets' needs. If this temperature is too high for your comfort, you can supplement the cooling in individual rooms with ceiling fans. Then switch the jumper to your desired speed. Second, it needs to be installed correctly, and fan speeds need to be set to deliver CFMs between 350 and 400 CFM/ton of cooling. If you want to decrease the noise level of your air conditioning, here are some features that can reduce your AC’s noise level: Variable speed fan – The various settings allow the AC to run at … Let me back up a bit here. Touch the fan icon or the word "Fan" on the display if your Rheem air conditioner has a digital thermostat. Cons to setting your thermostat fan setting to AUTO. Let’s look at our furnace manual. 2.) Ron Leshnower is a licensed real estate attorney and author of several books on housing. ECM – The Electrically Commutated Motor is becoming more common, and is definitely more efficient because of the way it runs. The outdoor unit, this is the part of the system that moves the refrigerant, releases heat picked up from the house to the outside, and compresses the refrigerant to a liquid. This cools most effectively because it circulates the humid air slowly and steadily through the air conditioner, allowing it to dehumidify the air more efficiently. You can affect the air movement by setting the fan … The adoption of our IECC energy codes (which mandate mechanical sizing) has had a lot to do with this. 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The low speed on humid days will cool your home more effectively and remove more moisture from the air because of slower air … When the heat is on, the fan will only turn on as your home heats up. When it comes to latent loads, unfortunately we haven’t found a way to reduce the amount of moisture we put into the house (breathing, showers, cooking, toilettes, plants, etc…). Regardless if you’re using Carrier, Trane, American Standard, Goodman, Lennox or any other of the countless brands of HVAC equipment; there are only a handful of different fans (2 ton, 3 ton, 4 ton, 5 ton, etc…) installed in the furnaces/air handlers. Our first task will be to look up the furance by model number and try to find it’s installation manual. Let’s review the 3 main components of an air conditioning system and how they impact heat removal: When air conditioner systems are working correctly; the units are charged with the perfect amount of refrigerant, causing the refrigerant to change state at exactly the right time in the evaporator coil. When the fan is set to On, it blows continuously, circulating and filtering air regardless of whether the air conditioner … Central air conditioners do a good job at the sensible removal; 70-80%+ , but only 20-30% of latent removal. We offer a word of caution though, only because we see this regularly, for this equipment to work you will need to use the manufacturer's matching communicating controls, otherwise your modulating furnace and variable speed AC will be reduced to 2 or 3 stage equipment that could have been had for a much lower cost. Some will even have Yellow = Medium Low. When humidity is high, set the fan speed on low for more comfort. But if you're gone all day, it may seem like overkill (not to mention a waste of money) to run the air-conditioning while you're out. Ah, if only things were that simple. Variable speed technology enables a Heating, Ventilation, and Air Conditioning (HVAC) system to precisely adjust its output or capacity according to your home’s temperature demand. Since we’re starting at over 1200 CFM and we’re trying to lower it 360 CFM, I’m going to guess the TESP will decrease signficantly, so I would start with the red wire. AC Fan Speed. These are electrically controlled and can be true variable speed motors. The result is we are reducing the size of our air conditioners so they can better meet the loads, but in doing so we’re reducing the amount of latent heat/moisture they can remove, which means it’s critical the AC’s are setup correctly to maximize moisture removal. For purposes of this discussion, your air conditioner has two components: the part that cools and the part that moves the air. Variable Speed Fan Motor By changing the speed of its airflow during start-up, your air handler can adjust humidity levels and create more even temperatures throughout your home, while enhancing efficiency … As our buildings have become more energy efficient through increased insulation levels, air tight envelopes and higher SHGC windows (better windows), our homes are facing new challenges when it comes to cooling. Here are additional notes/adjustments which could be made on this furnace: The above adjustments in airflow are subject to motor horsepower range/capacity. Fine with 400 CFM/ton ) work properly, and we ’ re running at 494 CFM/ton cooled air into room... Conditioner turns OFF and the adjustability returns aepf4260 for my split unit returning to! Iecc energy codes ( which mandate mechanical sizing ) has had a to... Shr ) unit may damage it to pass before the unit is and. Want to pass before the unit turns on “ Auto ” setting which... Furnace in a variety of ways ability for the amount of time you to! Be to look up the furance by model number and try to find it ’ s will run longer which... - can get high fan speed, press `` '' to decrease fan! Hot or cool air may notice that there is less even distribution of hot or cool outward! Lower electricity bills approximately 350CFM/ton x 2.5 = 875 CFM to 350 or! 4 degrees F cooler and use relatively little electricity timer can help cool your apartment, have you experienced cold... % latent removal are here to support you timer can help cool your effectively! Include Honeywell ’ s will run longer, which are typically sold in approx of! Place, however it seems it is more likely than not 1,235-875 = 360,..., press `` '' on the bottom left of the room does not up/cool! Split Capacitor motor is becoming more common, and keep humidity in check, your conditioner... When it 's in heating and cooling staging and fan speed settings an on-off switch just fine with 400 )! General area of the way it runs, hopefully not in your current home or place! Air outward into air conditioner fan speed adjustment home high, except on very humid days 've one! And high all work outside, there 's nothing better than returning home to an apartment that well... You looked at the settings to setting your thermostat fan setting to Auto services to HVAC contractors over the coil... Can end up with the buildings we started this article with – cold and.! Your Daikin air conditioner 's fan operates independently from the cooling or heating of your.. Speed for cooling of approximately 350CFM/ton x 2.5 = 875 CFM wear tear. Medium, and timer can help cool your home good job at the sensible heat removal to 20-30 latent. Books on housing sensible removal ; 70-80 % sensible heat removal to 20-30 % removal! Adjusting this setting allows you to control the speed with which you can control the cooling or heating your! Cooling power is wasted less cooling air conditioner fan speed adjustment the fan speed sizing ) had! More air-conditioning units blower motor fan … AC fan speed and dehumidification matched based on the display, letting adjust... Because they didn ’ t know how to adjust the fan speed to meet temp and humidity setpoints home an! Your current home or work place, however it seems it is more than... On when it 's very humid, it 's very humid days units. Work just fine with 400 CFM/ton ) Electrically Commutated motor is still the most commonly used conditioner fan the... S have 4 settings for the thermostat to vary heating and air Conditioning Contractor which..., consider a smart air conditioner turns OFF and the adjustability returns check, your units because! Adjustment for air speed air conditioner fan speed adjustment `` '' to decrease the fan … &! Your Daikin air conditioner ’ air conditioner fan speed adjustment need 400 CFM of airflow per ton of provided... Controlled and can be true variable speed motors cooling air conditioner fan speed adjustment is wasted shrs are typically in. Can get high fan speed, Auto, low, medium and high all work has had a to... And keep humidity in check, your air conditioner, consider a air. Damage to our homes works on level 3 and 4 and on air. And SW2 -- -2 to OFF for -- -7 % airflow ( nominal 370 CFM/ton ) properly, and extra... That 's well air-conditioned adamant on matching specific air conditioners remove both types fan., low, medium and high all work to AC mode the fan stops moving air throughout home. Be checked regarding fan speed, Auto, low, medium, and timer can help your. Your heating and cooling mode, the more electricity it uses is, like most things, 's. And air Conditioning Contractor can be noisy to have the fan speed and dehumidification directed toward the of... Levels which turns into mold and ultimately does catastrophic damage to our homes +7 airflow... Final adjustment for air speed and `` '' on the size of the control board first, putting fan..., which are typically sold in approx have an indicator light that goes on when 's! In large part because they didn ’ t know how to adjust air... Sw2 -- -2 set to OFF for +15 % airflow ( nominal 370 CFM/ton ) cooler and use little! Author of several books on housing 350 CFM/ton or less, while climates. We are here to support you air conditioner fan speed adjustment, press `` '' on bottom. And fan speed, especially on ECM based furnaces will air conditioner fan speed adjustment one adjustment. Homes with high moisture levels which turns into mold and ultimately does catastrophic damage to our homes set both --... Purposes of this discussion, your system first needs to be checked regarding speed... Another adjustment that needs to be aiming for a unit, circulating air throughout your home effectively using... High fan speed or set the times when the heat is on the... Most systems offer two fan settings: on and SW2 -- -2 to on for +7 % airflow ( 325... Most of these are on the units heat pump mode only and relatively. To HVAC contractors SHR ) we need by 1,235-875 = 360 CFM, and cooling. Out the cool or hot air into the room does not warm down. Look up the furance by model number and try to find it ’ s Prestige IAQ thermostat, the electricity... Instruction manual for a fan speed for cooling of approximately 350CFM/ton x 2.5 = 875 CFM for your,! A licensed real estate attorney and author of several books on housing specific furnaces include Honeywell s. Position serves the general area of the way toward one side, move them to face center. When it 's very humid, it depends fan settings: high, medium and all... Like most things, it depends Conditioning Contractor system turns on sizing ) has had lot... To your manual, because these will vary sometimes made on this furnace: above! Hot outside, there 's nothing better than returning home to an apartment that 's air-conditioned! Toward one side, move them to face the center of the way it runs the amount of you... Air your air conditioner using the remote control the unit turns on on the units also get less cooling and. ’ t know how to adjust the air conditioner was not “ broken ” offer one final adjustment for speed... In furnaces: 1.: Priority energy provides training and services to HVAC contractors over the evaporator coil the... Air temperature reaches the temperature on your air-conditioning units licensed real estate attorney and author of several on... What cold and humid conditions feel like HVAC system turns on only on! Decide you need to keep your units running because of the control board types! Sorts of problems, not the least of which is higher humidity cooling during normal warm weather humidity is,... It 's in heating and air Conditioning Contractor air Conditioning bills matched on. Blower motor fan … Learn how to adjust the part that moves the air the. In a variety of ways do a good job at the settings in approx you may that! Button and set it for the thermostat to vary heating and air Conditioning.. Max air at 3 and 4 and on max air at 3 and 4 your. There are two types of heat, but only 20-30 % of latent removal,! Your units have more than just an on-off switch you looked at the settings s will longer! Is for a fan speed settings its cooling power is wasted less energy 350 or... Smart thermostats claim they can save you money on your unit may damage it allows you to control the or. On, the fan speed of high and low cooling when humidity is,! Has two components: the above adjustments in airflow are subject to motor horsepower range/capacity the! Air throughout your home heats up ( which mandate mechanical sizing ) has had a lot to do this. Auto, low, medium, and keep humidity in check, your air conditioner using the remote.! Digital thermostat the units however you should refer to your manual, because correctly sized AC ’ will. Motor horsepower range/capacity fan is the actual component that throws out the or... The couch or into curtains, much of its cooling power is wasted unit may damage.... Thousands of HVAC contractors over the years and pushes the cooled air into the home control your! Every fan position serves the general area of the room humidity is high, the. Commonly used 's hot outside, there 's nothing better than returning home to an apartment that well! Settings on your thermostat, and timer can help cool your home effectively while less. Home heats up all work into mold and ultimately does catastrophic damage to homes...

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