Posted by bc on April 16, 2010 at 07:49:27 from (68.92.139.215):
In Reply to: Re: Thanks to all posted by bill b va on April 15, 2010 at 18:52:20:
Bill is right here Gun. I don't know how much humidity you get off the lakes up there up there in Saginaw but 3 tons is probably enough.
Your problem probably lies in the distribution system. Maybe you can adjust registers, put dampners in the lines or set up a two stage system with electronic dampners in the lines. All expensive except for pinching off some of the registers to get more to the bedroom.
I would bet that the thermostat is by the living room so it shuts down before the bedroom gets cool. Pinching off registers may help there or you could move the thermostat.
It could be an issue with vent pipe sizing and if you are at the end of the run. Also before air can blow into a room, the return air vent has to take the old back to the a/c. Sometimes they undersize the return air vents to one stud cavity when it should be bigger and especially for big bedrooms at the end of the run. If leaving the door open helps then you have a flow problem.
One test the pros use is to place a kleenex over all the vents to compare how the blow. Then place a kleenex or tissue paper over the return and the suction should hold it in place (door closed). With multiple subcontractors around, I've heard of return vents installed in the wall but no one cut the stud plate and hole in the floor for the air to flow back.
More important than sizing the tonnage of the a/c unit for the house is sizing the plenum, outgoing, and return vents. They have to be sized so there is a pressure differential between the two and so each room vent carries the same volume. This is key to distribution and is hit and miss with alot of hvac techs.
On the other hand, if the bedroom is on the end of the run, your wife is having hot flashes from menapause, then get a small window unit so you can sleep comfortably and then you don't have to cool down the whole house as much may be the easiest way.
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