I live in North Florida and the temperature seems to drop into the 30's maybe 10-15 days out of the year and the 20's maybe 2-5 times a year. We had a few days where the highs were in the 30's this past week. I noticed that my first floor seemed cooler and that the thermostat was showing 62-65 a few times while the target was 68. The second floor was fine 67/67. We were out of town the previous weekend and I had set the first floor to 55 because it was not very cold while we were gone. Actual temp on first flow was 63 when we got back. I'm not sure if it struggled the next few days to get to 68 because it was already down at 63 when extreme cold hit or if there is a bigger issue. I also notice a lot of condensation on the inside of our double pane windows. Does all of this sound normal? The first floor system is a Carrier from circa 1996/1997. I think it is a 10 SEER. I think the same is true upstairs, but it is a smaller unit. I believe both are heat pumps. Appreciate any insight.
Update: My wife just texted me a picture and the outside of our air compressor is completely frosted with ice. It was not like this earlier in the week AFAIK.