We just had a new Amana 18 SEER heat pump installed in our Southern Indiana home Jan 3 and have had nothing but problems ever since. Condensing unit is ASZC180481AC, Air Handler is AVPTC426014AA and ComfortNet communicating thermostat #CTK01AA. We replaced an older 12 SEER 3 ton Bryant heat pump that was having issues. We have a 1647 SF one-story home (over a crawl space)that we bought 3 years ago and gutted 90% of it and reinsulated prob. 90% of all exterior walls, installed new construction Low E argon-filled windows and replaced all but one exterior door. Needless to say, the house is not drafty. We had a larger 4 ton unit installed because we are adding an addition onto the house this spring. We also had all new duct work installed because we previously did not have any cold air returns in the house.
Now the issue. Our first electric bill was $438 from 12/15 to 1/19 (avg 117.85 kw/day and Avg daily temp 39). We had to run on EM heat strips (10 Kw) from 12/15 to 1/3 when the new heat pump was installed. The new heat pump constantly cycled on & off. Sometimes it was 3 minute on/off cycles and sometimes at night it would be off for 10 min & then run for hours. We had it set at 68-70. We had the installers out at least 2-3 times each week during January because of the constant cycling. It warmed the house, but it ran at least half the time.
Between 1/19 (when the meter was read) and 1/29, we used 1186 Kw (Avg 118.6 Kw/day). We talked to the installers again and said something had to be done because we were using as much electricity as we had when we were running on EM heat strips with the old unit! They were calling Amana and trying various suggestions. Nothing helped. We finally said we wanted another unit and they agreed to replace it.
New unit installed 2/8 and nothing has changed. It was still running short cycles. Amanda tech rep here on 2/10 (left vehicle running in the driveway and brought nothing but a notepad). Suggested running shielded new thermostat wire because he thought it was high voltage interference. Told us that there was no way this unit was causing our high electric usage and left. Wire changed -- no change. Between 2/8 & 2/14 we used 712 Kw (Avg 118 Kw/day). In desperation, we turned off the furnace on 2/14 for 24 hours and continued to use everything else as normal. Used 50 Kw in 24 hours and temp in house dropped 11 degrees.
Does anyone have any idea what could be causing the constant cycling and high electric usage? Thermostat does not show EM being used at any time.