O.K.--I have searched the forums and read quite a bit of good information here, but have a question or two that I thought you all might be able to answer. I live in Kansas City in a 2800 s.f. front to back split, southwest exposure. Last year I had a new heat pump system installed, a Lennox hp26 4 ton, a G51mp 48c 110 furnance, matching 4 ton lennox cased coil with TXV valve. This replaced the 15 year old 3-1/2 ton Carrier system. No load calc was done (obviously). The reasoning for the upsize was that my older system wouldn't cool the house down on the hottest days and upsizing would gain me some on the heating end of the deal as well as help with the cooling. Well I went on to install siding with a little insulation and new energy efficient double pane windows. Guess what problem I'm having now? Short cycling of the A.C. (at least I think so) Well here's what I'm getting---18 to 20 degree drop, return to supply, inside humidty 39 to 44 percent @ 73 to 74 degrees, cycle times of 8 to 12 minutes on, 8 to 12 minutes off (outside temp in the mid 80's). I know this isn't too bad, but what if I dropped the blower speed a notch? Would this increase the head pressure? If I were to drop the blower speed would the freon charge need to be changed? Will I be able to get longer run times with a lower blower speed ? I have a Lennox T8611G(honeywell) digital setback stat that calls for heat or cool at a 1 degree difference,is there a Heatpump stat that has a 2 degree setting? Or should I just leave well enough alone and quit bothering you all with petty questions? Any advice will be greatly appreciated.
[Edited by lyork on 06-19-2005 at 11:45 PM]