Problem: Will a larger blower motor help my air conditioning? My air conditioner does not seem to be blowing air very hard.
Answer: I would like to recommend checking your furnace’s blower motor capacitor to make sure the capacitor is not weak. A weak motor capacitor can cause the blower to run slow. Please click here if you would like to see the capacitors that we sell. Some small appliance shops will test capacitors free of charge. I would also recommend that you check to make sure your blower wheel (squirrel cage) and the bottom of your air conditioner evaporator coil is clean before trying a larger motor. I would recommend checking your refrigerant charge to make sure you AC is charged up properly. If your AC system is low on charge it will cause the coil to freeze up and cause a restriction in the air flow. Rule of thumb is the blower should produce 440 CFM (cubic feet per minute) of air per ton. On a two ton system that is 880 cfm. This usually calculates out to about a 1/4 to 1/3 HP blower motor. If you get too much cfm it is hard on the air conditioner, because it robs the air conditioner of the cool gas going back to the compressor to keep it running cool and you have to over-charge the AC unit to get the cool gas going back to the compressor. I usually need to add refrigerant to a system that has too large of a blower motor. You want to charge your system so that there is cool gas going back to the compressor and the suction line feels like a cold coke can right out of the refrigerator. The air conditioner should make a 15 to 20 degree difference in the ambient air. If you home is 75 degrees inside, the air coming out of the registers should be between 55 to 60. I hope I have answered you question. I have installed oversized blower motors before to get more airflow. I would not recommend going over 1/3 horsepower in your case. You would need to check the charge after you install the new motor to make sure you are getting the needed cool gas back to the compressor. Below we have a real good YouTube video produced by hvacrepairguy which shows how to replace a blower motor. Thanks to hvacrepairguy for making this informative video! Please click here if you would like to see other DIY videos on how to test capacitors and clean AC evaporator coils. If you have any questions please email us anytime at: email@example.com or comment in our comments section below. We would love to help you out and have your business!