Your comment about the set-backs just reminded me I wanted to change mine.
My wife likes it cool at night, but I'm getting so old that I need it to be a tad warmer.
I'm all re-programed for a faster recovery time in the mornings.
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"the temperature at the supply register is much lower than my gas furnace puts out. aprox 10 to 15 degrees different. "
I've read there can be a large percentage of heat loss in hot air duct work.
Plus sometimes there is loss of air flow, due to resistance in the duct (tight turns etc).
I'm adding insulation on the basement pipes that feed my forced-hot-water baseboards. Not too hard.
I'll bet insulating duct work isn't as easy.
I've been looking at the prices on those mini-split ductless units
(Since we have no duct work at all) and they seem to be good performers.
SINGLE ZONE 17 SEER 24000 BTU HEAT PUMP SYSTEM
24,000 BTU for a measly 2490 watts.. That's like running two little space
heaters (that would give me 8500 BTU).
I like how these units use variable speed DC motors on the compressors.
So, it can run a lower speeds when demand is low.. Instead of going on and off.
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I knew my attic insulation wasn't too good. Since it's no where near the
recommended R38.. I've checked the attic temps this week during
the day and late at night and I can see the attic needs more 'R' factor..
My warm air is being wasted in the attic!
After a mostly cold cloudy day (not much solar), at 1 AM, it was 20F outdoors and 30.8F in the attic.. (65F indoors).
Picking up some rolls of fiberglass tomorrow..