I put this in the uncategorized category since I didn’t easily see a section where Beestat users could get some assistance on configuring their HVAC systems using data from Beestat.

Anyway, I have a 2-stage 5-ton A/C. The temperature differential was configured to be 2 degrees. And the second stage kicks in after 20 minutes. I’m fairly satisfied with comfort, and indoor humidity.

Yesterday morning, I changed the differential to 1.5 degrees, without changing anything else. On the Beestat graph below, I’m just comparing the runtime on the night before last v/s last night. The outdoor temp in both cases was about 77F.

On the night before last, the system ran a total of 5 times during my Sleep profile (purple bar). It ran for 100 minutes in Stage 1 and 71 minutes in Stage 2. In Stage 2, the compressor pulls about 1.33x the Amps pulled in Stage 1, so I make that a total of “194” Stage 1 equivalent minutes.

Last night, it ran a total of 6 times for 150 minutes in Stage 1 and 22 minutes in Stage 2. Using the same calculation as above makes that a total of “179” Stage 1 equivalent minutes.

So that’s about 8% less in terms of power consumption, although there is one extra compressor start.

There was one addition difference. The night before last, indoor RH was about 52%. Last night it was 54%. In either case, there was no noticeable difference in comfort.

For a system like mine, what would be better? The higher differential, which reduces the number of times the compressor turns on by 16%, or the lower differential, which reduces energy consumption by 8%?

I hope other users will chip in with their thoughts. Thanks!