House Air Conditioners - Blogs & Forums On Home Heating & Air Cooling Systems

Blog Title: should you have a large blower motor for air conditioner

Main Que: Will a larger blower motor help my air conditioning? My air conditioner does not seem to be blowing very hard.

  • Category:
  • Query By: GORDON BANKS (Osceola, CA)
  • Date: 10/08/2014

Answer: I would check your refrigerant charge first because if your 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 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 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 these helps.

  • Replied By: CHERYL RIVERA (Leadville North, FL)
  • Replied Date: 10/15/2014