Can Blower be set on too high of a speed?

caddopecanSeptember 2, 2012

Recently we had a circuit board burn out on the condenser/furnace unit in the attic. It was replaced and wiring reconnected by the AC serviceman. Now it seems that the blower is blowing too much air because the blower noise is much louder and the air returns are moving much more air than in the past. Also the room temperature seems to be different even though the thermostat settings are the same. We were satisfied with the operation of the AC before this service repair work. So, we have a few questions. Is the blower supposed to be set at the fastest speed for cooling and at a different speed for heat? Can the blower be set at a lower speed for cooling or does this lose efficiency and increase cost? Does increasing the blower speed raise the cool air temperature across the condenser coil and increase the humidity inside the house?

Thank you for reporting this comment. Undo

It is possible the blower fan has been set to the wrong speed. The fan speed for the AC should be 350-400 CFM per ton of cooling. Increasing the fan speed will raise the cool air temperature. The coil will not do as good a job of removing humidity. Normally there is a fan speed for heating and one for cooling for a single stage system.

    Bookmark   September 2, 2012 at 3:01PM
Thank you for reporting this comment. Undo

I agree with Mike

There s an inverse relationship between fan speed and humidity removal and BTU output.


    Bookmark   September 2, 2012 at 4:48PM
Sign Up to comment
More Discussions
Maytag/Nordyne/Nortek HVAC
Wanted to share my HVAC experience. Hopefully save...
No Fully Trained Mini Split Installers
Reading threads about mini split heat pumps I got curious...
1 vs. 2 stage cooling? 80% vs. 95% furnace?
I'm in SoCal near L.A. (zip 91354). Two story house...
M. A.
Thoughts on proposed HVAC system?
To start: my house is two-level (main plus upper)...
company insists on all payment in advance
Having 2 mini-splits installed, have already paid half...
Sponsored Products
Round Cafe Folding Table, Patio Furniture
$229.00 | FRONTGATE
MaxLite RKL45U5535DV LED RKL Retrofit Kit Strips, 3500K
Empress Leather Sofa in Black
$699.00 | LexMod
Romeo Moon S2 Pendant by Flos Lighting
$875.00 | Lumens
Brushed Nickel Four-Light Wall Sconce
$429.00 | Bellacor
Artemis XL5 Ceiling Fan
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™