Take the 2-minute tour ×
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

I have one of those medium sized AC-units (don't know the model name at the moment) and a very basic Honeywell thermostat that the installers put in when the house was built.

However, there doesn't seem to be much options. I can only turn the fan on or off, AC on or off, set the schedule, and the desired temp.

Is there a way to control the fan speed (It's quite loud and I'm planning on renting the basement out... with the AC unit right next to the basement window) like those portable AC units? Is this dependent on the thermostat or the AC unit itself?

share|improve this question
    
Do you want to control the speed of the outside condensing unit fan, or the inside blower fan? What type of A/C system do you have? –  Tester101 Jul 1 '13 at 12:40

1 Answer 1

up vote 1 down vote accepted

Condensing Unit Fan

If you're talking about controlling the speed of the fan in the outside condensing unit, the answer is no.

Condensing Unit

The job of this fan, is to remove heat from the coolant flowing through the system. Reducing the speed of the fan would reduce the cooling effectiveness of the system, and could lead to damage to, or premature failure of the system.

Blower Fan

If you're talking about reducing the speed of the blower fan (the fan that circulates air throughout the house), the answer is no again.

The job of this fan is to add heat to the coolant flowing through the system. Reducing the speed of the fan would reduce the cooling effectiveness of the system, and could lead to damage to, or premature failure of the system.

share|improve this answer
    
+1 Nice Answer - Although probably off tune music to the ears of the OP. –  Michael Karas Jul 1 '13 at 14:34
    
Thanks for the answer. So there's nothing I can do... but how come those portable A/Cs have fan speed settings? –  Jack Jul 1 '13 at 17:36
    
@jack I'm not sure what portable A/C's you're talking about, could you supply a link? –  Tester101 Jul 1 '13 at 17:54
    
He's talking about the fan speed setting on a window mounted portable A/C unit. To the OP: An A/C has two heat exchangers, with fans blowing air across them. In a window A/C unit, it is the evaporator fan that has adjustable speed. This is equivalent to the fan inside your house with a split (aka "central") A/C system. There are in fact air handlers with variable speed fans. (Search "variable speed air handler") But they have to be made that way. Now, back to the key point: You said the A/C unit is right next to the window. If that is the outside condenser unit, it will be constant speed. –  Tim B Jul 2 '13 at 13:02
    
I will add that I've heard of variable speed A/C compressors, but it's the same as the air handler: If it was built as a constant speed unit, you can't change that. In theory you could pull it apart and find a replacement variable-speed motor that fits, add controls for it, but I think that is beyond the scope of what you're asking –  Tim B Jul 2 '13 at 13:04

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.