I have read through many of the older posts (most are rather dated) regarding the single vs two stage furnaces. Issues with two stage: longer fan run times, lower efficiency of combustion at stage 1, costlier repair parts, costlier to purchase = little to no savings, maybe even spend more. That is a summary from what I have researched and again those threads were pretty dated. In application TODAY, these are now using ECM motors - will these motors along with the variable speeds still provide in reality similar savings to the single stage (running an ECM motor) in regard to the electrical costs?
The other primary issue was the combustion inefficiency. Again, it's been a number of years since some of those discussions - has there been an improvement in this regard or is it just physics we are dealing with and that's how it will always be? Meaning, there is still lower efficiency in stage one of the two stage furnaces? I realize that some of the reports from the manufacturer's labs show very small changes in efficiency, but that is not reality after installation in a home environment.
I have a single story home 1275 sq ft with a partially finished basement. In application, I see a potential for a two stage to feed the rooms at the end of the house (bedrooms at one end, Kitchen/family room take up the other end) better, but that is a minor concern as we just don't spend that much time in those rooms except for sleeping. It appears from what I have read that trying to more evenly heat the basement (large area unfinished, two bedrooms and a bathroom finished) with a two stage is a losing proposition.
My assessment is that a two stage will not provide much of a benefit in my application - or should some of the answers to my questions and statements change that?
Thanks in advance for your insights!
The other primary issue was the combustion inefficiency. Again, it's been a number of years since some of those discussions - has there been an improvement in this regard or is it just physics we are dealing with and that's how it will always be? Meaning, there is still lower efficiency in stage one of the two stage furnaces? I realize that some of the reports from the manufacturer's labs show very small changes in efficiency, but that is not reality after installation in a home environment.
I have a single story home 1275 sq ft with a partially finished basement. In application, I see a potential for a two stage to feed the rooms at the end of the house (bedrooms at one end, Kitchen/family room take up the other end) better, but that is a minor concern as we just don't spend that much time in those rooms except for sleeping. It appears from what I have read that trying to more evenly heat the basement (large area unfinished, two bedrooms and a bathroom finished) with a two stage is a losing proposition.
My assessment is that a two stage will not provide much of a benefit in my application - or should some of the answers to my questions and statements change that?
Thanks in advance for your insights!
source https://hvac-talk.com/vbb/showthread.php?2225875-Theory-and-application-single-and-two-stage-furnace-question&goto=newpost
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