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| Pete C. wrote:
> house drift up to 90 degrees during the day while I'm trying to work
> isn't exactly feasible. I also find I have less tolerance to higher
> temps when I'm trying to sleep so a night setback won't cut it.
here's how we solved this issue, based on a tip from some friends in the
hvac business
it seems logical that an indoor comfort factor is driven off a combination
of temperature and humidity. most single speed blower systems and single
compressor/single stage systems maintain temp and humidity in the comfort
zone only when system is running but humidity can creep up to discomfort
quicker than temp setpoint being triggered for the next run cycle
so, we installed a dual-compressor system with a very small 12k BTU stage1
and 36k BTU stage2 with a variable speed blower
the thermostat is programmed to run independently a humidity based cycle,
using only the 12k BTU stage1 compressor, changed daily according to OD
weather (ie. higher setpoint for solid rain days, vs. dry-high temp days)
the RH% sensitivity is +2/-2 percent and normally keeps house at 40-42%
which is excellent in the deep south, almost on the beach
as a backup, the system keeps temp setpoint at 78F during days and 77F at
night and uses a separate program to run on stage1 compressor the first 50
minutes when running due to temp setpoint trigger and switches to the larger
stage2 compressor after 50 minutes and reaches target temp within a few
minutes (no matter if OD temps are high 90's)
the comfort in a house with 77/78F and RH% at 40-42% is great, compared to
our old single compressor, single speed blower which maintained temp but
humidity was over 10 percent higher and fluctuated violently through the day
our electric bill is over $150 less per month with the new system
hope that helps
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