So remove a return-air filter and, if you can’t see what’s on the other side, replace it. If a clog forms higher in the line where you can’t physically reach it, suction on the end of the line will usually remove it. If it’s been more than a couple of months since you’ve replaced the return-air … If the fan motor is bad, then the outdoor unit’s fan can’t help dissipate heat, meaning that the AC can’t cool your house. Have You Been Changing Your Furnace Filter? You might not think your filter contributes to your AC … Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY. Each one will be on a separate breaker. Freon is federally regulated and may only be handled by a licensed HVAC professional. If the switch was accidentally set to “Fan,” however, the unit will blow air through the duct system, but no cooling will take place. When this happens, some AC units will stop cooling while others will shut down completely. This can indicate a blockage caused by dirty filters or debris in the condenser. Shut off the power to both the exterior and interior units at the breaker panel. Consider looking at local services to help solve your problem. Air conditioners work in part by removing humidity from the air (through condensation), and that moisture must go somewhere. That’s the job of a condensation drain hose—it directs water to a floor drain or to the outside of your home, depending on your system. Rebates available from New Jersey’s Clean Energy Program. When filters get clogged with animal fur and dust, the AC system can’t draw in sufficient air, and as a result, only a wimpy flow of air comes out. You agree that BobVila.com may process your data in the manner described by our Privacy Policy. Condensation drains are subject to blockage by mold and algae growth. If a duct somewhere between the blower and a room register (the metal grill that covers the opening of an HVAC duct) has broken, the cold air could be blowing out before it reaches the room’s register. The unit’s fan blows air over those icy coils, which forces cooled air through your home’s ducting. What’s the Cost of an R-22 Refrigerant Recharge for My Home AC? If cool air is blowing from some registers but not from others, there’s a good chance the ducting that feeds the registers is at fault. When you don’t have enough, your AC can’t absorb enough heat to cool the air. Refrigerant is the liquid that absorbs the heat from your air. After removing a mold or algae clog, pour a couple of cups of white vinegar into the condensation pan that lies beneath the evaporator coils in the inside blower unit (learn how to access and identify the coils and the condensation pan below). Walk you through the 4 troubleshooting tips to try before calling in a professional, Explain the larger problems you might have if you’ve exhausted your troubleshooting options and are still experiencing the problem, Frozen refrigerant line on your outdoor unit (you’ll see the ice buildup), You hear a hissing/bubbling noise near the AC (this indicates a significant leak), Your home is unusually dusty (from the dust in your attic). Sometimes, a small fence may have been installed around it to keep it from detracting from the rest of the landscape. If your AC isn’t cooling your home, check to see if: Your thermostat is switched to ON; Your air filter is dirty; Your outside unit is dirty; Your circuit breaker is tripped; If you’ve checked for the problems above, but your AC still isn’t cooling down the house, you probably have a … Bob Vila, only be handled by a licensed HVAC professional, 10 Cleaning Chores You Should Be Doing Every Week, 7 HVAC Mistakes That Drive Up Summer Cooling Costs, 13 Home Improvements That Are Illegal to DIY, 15 Little Signs Your House Has a Big Problem. Air conditioning systems operate on a basic scientific process called “phase conversion.” Refrigerant, the liquid used in an AC system, undergoes a continuous cycle of evaporation and condensation within the unit’s sealed coil system. Check and reset the switch to “Automatic,” if necessary. If you see a clog, carefully clear it out with the end of a small screwdriver or similar narrow item. compressor is the most expensive part of the AC. A: It’s the last thing you want on a sweltering summer’s day—a central air conditioning system that’s not blowing cold air. When either set of coils becomes dirty or covered with mold and debris, cold air output can suffer.