Air Conditioner FAQs

How does a window air conditioner work?
Window air conditioners work on exactly the same principles as a refrigerator or dehumidifier. They have a cooling system that refrigerates the air entering the unit and then expels the heat from the back of the air conditioner.
What size air conditioner do I need for my home?
Can I run my air conditioner all year long?
Are window air conditioners expensive to run?
Is it normal for my unit to run continuously?
Do window air conditioners affect a room’s humidity level?
How can I improve the efficiency of my window air conditioner?
Something’s broken. Help.
How does a window air conditioner work?
Window air conditioners work on exactly the same principles as a refrigerator or dehumidifier. They have a cooling system that refrigerates the air entering the unit and then expels the heat from the back of the air conditioner.
What size air conditioner do I need for my home?
If you’re in the market for a new air conditioner, make sure you purchase the correct size for your home’s needs. An undersized air conditioner will have to work harder, waste energy and cost you more money. Conversely, an oversized unit will cycle too quickly and may not run long enough to remove humidity in the air. A little homework will go a long way in ensuring you find the right size air conditioner to maximum efficiency and save money. Here’s an easy way to determine what size air conditioner is best for your space and needs: 1. Measure your window size. 2. Check the power available near the window. Most larger air conditioners require a dedicated circuit and some require a 220 volt circuit. 3. Cooling capacity is measured in British thermal units (Btus) per hour. You’ll need to calculate the number of Btus required for your space. Use the handy chart below and consider the following factors: • If you have high ceilings or multiple windows in your space, you’ll need to increase required Btus slightly. • If your space is highly shaded, you can reduce the required Btus by 10 percent. • If there is abundant sunshine in your space, increase the required Btus by 10 percent. • If the space includes a kitchen, add 4,000 Btus. Due to cooking, kitchens generate more heat than other rooms. • Add 600 Btus per person who regularly spends time in the room or space. Here are the recommend sizes listed by square footage of the area to be cooled. All figures are based on a room with a ceiling height of eight feet. Square footage of area to be cooled/capacity needed (Btus /HR) 100 to 150 = 5,000 150 to 250 = 6,000 250 to 300 = 7,000 300 to 350 = 8,000 350 to 400 = 9,000 400 to 450 = 10,000 450 to 550 = 12,000 550 to 700 = 14,000 700 to 1,000 = 18,000 1,200 to 1,400 = 23,000 1,400 to 1,500 = 24,000 Source: www.EnergyStar.gov The moisture in the air condenses on the refrigerated coils and drips into the bottom pan of the air conditioner where it is picked up by the condenser fan blade and used to help cool the condenser coils. The heat which is removed from the home through the evaporator coils is conducted into a refrigerant gas and then travels through a radiator-like set of coils on the back of the unit. The condenser fan circulates outside air across the coils to cool them.
Can I run my air conditioner all year long?
You can run the air conditioner as often as you need, if both the outside and inside temperatures are above 60 degrees Fahrenheit (15 degrees Celsius). If the inside or outdoor temperature is below 60 degrees Fahrenheit (15 degrees Celsius), the unit may not function properly.
Are window air conditioners expensive to run?
Yes, window air conditioners use a considerable amount of energy. A standard, single-room air conditioner will cost approximately seven to 12 cents per hour to operate. If you run the air conditioner for eight hours per day, it will cost you approximately $24.40 per month at $.10 per kilowatt hour. That’s why it’s important to make sure you have the right size unit for your space. Please see the sizing information above.
Is it normal for my unit to run continuously?
No, if your unit is running continuously, it’s struggling to meet the set temperature. You can troubleshoot this using the following steps: 1. Use a thermometer to check the temperature of the air in the room. 2. Check the temperature of the air blowing out of the unit. The difference between these temperatures should be at least 15 degrees. If the difference is fewer than 15 degrees, the unit is likely malfunctioning and you’ll need to troubleshoot further. If the temperature difference is at least 15 degrees and yet the room is still not cooling enough, check to be sure the unit has enough Btus for the space to be cooled.
Do window air conditioners affect a room’s humidity level?
Yes, window air conditioners remove humidity in the air. The evaporator coils located in the front of the air conditioner grow cold during normal operation. As the warm, moist air in the room comes in contact with the cold evaporator, the air’s moisture condenses and attaches to the evaporator coil. As more moisture condenses, moisture on the coil drips into the base of the air conditioner where it is evaporated to the outside of the home.
How can I improve the efficiency of my window air conditioner?
• Avoid placing the unit in windows that receive direct sunlight • Use ceiling fans in evenings • Limit use of heat-generating appliances such as ranges and toaster ovens • Check out www.EnergyStar.gov for helpful tips on energy conservation
Something’s broken. Help.
RepairClinic.com has replacement parts and accessories for window air conditioners including air filters, covers, remote controls, knobs, touch-up paint, side curtains with frames and many other products. Enter your air conditioner model number to find the parts for your model.