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Old 11-02-20, 08:46 AM   #15
jeff5may
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I see a few fundamental misconceptions with your project. Just going to ask a few questions to clear up the mystery.

So the system you have running is a constant output unit that you have running full blast for a short time to satisfy a whole day's demand? And you plan to substitute this unit for a variable speed unit of similar capacity? You may pick up a fair amount of efficiency, but at what cost? A finance payment on a new outdoor unit will probably equal the existing unit's electric bill.

If your existing unit has capillary tube metering, you may be able to increase its efficiency at a pretty low cost. There are a few ways to accomplish this. Which way to go depends a lot on the existing unit, as well as your skill set and confidence level.

I'm assuming this system is your primary home heating. Of so, and you don't have sufficient backup heat, a diy solution might not be the best idea. These things tend to fail during the most extreme conditions when you need them the most.
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