As much as I would like to say I am an expert, I am not when it comes to the actual performance and settings of a residential gas furnace and air conditioning unit.  So I am hoping some would be willing to share their incite or at least some resources I could go to.

So my question is about the fan speed settings for the heating and cooling system.  Two years ago I had a new Tempstar 95AFUE two stage variable speed furnace installed.  It is my understanding that even though it is a variable speed fan that you want to adjust fan speed differently for the heating and cooling system.  I ask because the service tech was at the house today on an A/C tune up & when my wife inquired about the fan speed, she was told it was on the factory settings.

So is this true, with variable speed motors you don't have to worry about the fan speed, or should there have been some kind of adjustments at time of the original install?  And for future service calls by potentially another company, what kind of testing should I ask for to be done to see if the CFM moving through the system are appropriate for the season.

Thanks in advance!


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Sounds like to me that you have a system installed and it has never been setup properly. Have a Service Tech come by and set it up for you.

A quick static pressure test would help you determine if you're getting the flow you need over the coil.   You should be able to reference your manufacturer's documentation for the TESP.   If it's too high, then it would be time to call in for a clean and tune as well as test and balance.   

Just my $0.02.

this is what I do for 25 yr.  I find most res unit are mid .8" water Col.   The tag on side of air mover says .5 or .4

you can look at SP or feet per min or temp, you get the same model.  This is big,  very big


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