• When looking for a new air conditioning unit look for these things; a SEER rating of 13 or higher,  variable speed air handler for new ventilation systems, one that will operate quietly, has a fan-only switch, filter check light, and an automatic-delay fan switch to turn off the fan a few minutes after the compressor turns off.  Talk with your air conditioner repair Denver technician for more help choosing the right unit for your  home.