Would appreciate some help and advice. I live in Iowa (cold winters, hot humid summers and everything in between) and just bought a new house. Itís a ranch with a walkout basement. There are 1980 sq. ft. on the main level and the same below. Nothing is finished yet in the basement. House itself is built wellógood insulation and though I think the windows are not real great, a blower door test indicated .12 air infiltration. I guess that means their ok? Back on point.
Iím not real happy with the heating system. Iíve got a single-stage WeatherKing 92 AFUE 105k output Btuh model 90RJ10EGS01. Iíve got a WeatherKing 12 Seer AC with an Aspen coil. Itís a 4 ton and the model is 12AJA4801. The builder went with a 4 ton because he said that will be necessary if the basement is finished off someday.
The problems that I currently have are noise and the house feels cool at times. Iíve called a couple of places to get some advice and opinions, but none of them seem to have the knowledge that some of you folks have.
The general consensus is that my noise problem is ducting. I thought it was the unit itself and still think that might be part of the problem. The blower sounds loud when I compare it to my parentís lennox which is also single-stage 100k output. Iíve been told my trunk ducts are two small. The furnace is centrally located in the basement and has two trunk supply ducts running in each direction. The one duct measures 8 x 14 and the other is 8 x16 for about 5 feet and then reduces down to 8 x 14 for the remaining run. The cold air return is all 8 x 14.
On another board, I was told the unit is oversized and that is part of the problem. I did a load calc using heatpro and it said I should be more in the 75k output range with a finished basement. The person who said it was oversized also said thereís no way my duct system will handle the 4 ton a/c. The heatpro calc suggested trunks sized 8 x 18. I should mention that all of my supply runs are the rigid 5Ē pipe.
The real issue is that Iím planning on finishing the basement soon. Unlike Jeff, however, Iím lucky in that itís wide open and I can basically change anything I want. Of course it all costs, but I have access to everything. I want to balance comfort and noise and right now both seem a little out of whack. Iím planning on adding five more supply runs in the basement. The only part that seems ok are my cold air returns. Thereís one in each bedroom near the ceiling, one in the living room near the ceiling, and a spot for one in the basement at ground level.
Will adding the five additional runs in the basement help or hurt my situation? Is my ducting really not going to be able to handle the 4 tons of cooling? Are my furnace and AC way oversized? How can I reduce the noise and increase comfort?
I realize this is a short novel, but Iím not touching anything in the basement until I get some good advice. Iím not that confident in the local contractors. Iím looking to you good folks for some advice. I appreciate any constructive feedback you give.
If anyone would like a photo of my layout, Posting your email address is against the Forum Rules Sometimes a picture is worth a thousand words.
[Edited by Lusker on 02-03-2006 at 06:27 PM]