Have new 80K XV95 thats been running for heat 1 month. Works great.
So far only runs in 1st stage and is set for NORMAL 1000 CFMs and is quieter than old 1200 CFM heat... Very happy with performance.
Have run in 2nd Stage by changing temp on tstat and a little noisier since running at 1400 CFMs and quite frankly suspect ducts were sized for older 1200 CFM unit.
Verified temp rise and ESP appears to be around 0.5 in 1st stage but increase to around 0.7 in 2nd stage based on Service Facts table.
Would like to consider lowing airflow to make unit even quieter. Before I have contractor out to lower to Medium Low setting (890 CFM and 1260 CFM), I want to understand the pros and cons of lowering CFMs in HEAT mode.
Based on "Service Facts" of XV95, I can expect a 1st stage temp rise of 50 and a second stage rise of 54 at 890 CFM and 1260 CFM respectively.
So how will lower CFMs affect:
(2) Heat Exchanger Longevity
(3) Comfort (specifically between floors)
(4) Noise (I know this answer already)
(5) Will unit run longer or will output air just be hotter???
(6) Power consumption of blower motor will go down.
I don't see the negatives - but there must be some.
What tests should I insist that contractor perform to ensure lower settings are not doing harm (I need to be an intelligent consumer).....I suspect he'll change settings and then simply verify temp rise against the "Service Facts" table. Is that sufficient??