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ray, I'm a home owner and also live the Charlotte area. I would agree that you should get a second opinion. I have a friend in Gastonia who recommends Gastonia Sheet Metal. They have been around...

Dash, thanks for the response. Yea, that company is Tamarack Technologies, Inc and they call it RAP (Return Air Pathway). Last time I checked their web site seems like they're pricing was based on...

dash


Dash or other members, I'm a homeowner and trying to learn too. I need to add a return path also for a bedroom that gets the door closed frequently, and was wondering how is the best...

wyounder;
I have seen this deration formula specified in Carrier/Bryant documentation. Does this formula work for other equipment manufacturers?

karonski, i'm a homeowner but as a sanity check to what the contractors are proposing, you can click on the red hvac-calc button above and for about $50 you can run your own load calculation. I wish...

Diito wyounger, you explained an oversized furnace exactly.

brewyourown, i reponded to your post because it sounded alot like my situation. read the responses to my thread.
http://www.hvac-talk.com/vbb/showthread.php?threadid=89979

brewyourown, I'm a homeowner as well but your description of furnace cycling is very similar to mine. In my home I have 1714sq ft with 87K BTUH output furnace and its way oversized. I'll let the...

Ditto to JoeSix, I'm a homeowner too and stuck with an 87K BTUH output furnace that runs for 5-7 minutes. My heat loss calculation were 37K at 22 deg F.

dougjrs, I'm a homeowner and wanted to comment on your statement about the 6" of insulation in the ceiling. I was wondering what R value you used? I believe cellulose insulation is shredded...

midwest, thanks for your response. My temperature rise is around 50 degrees which falls in middle of spec (35-65 deg). One of the reasons I posted the question to you pro's is to ask which supply...

What are the typical output temperatures of condensing furnaces? I have an Amana Air Command 90 furnace and I'm getting a discharge temperature of 120 degrees. In Manual J it states to use 100...

dougjrs, I'm a home owner but I do have a copy of the Manual J book and it states the following "Make "best estimate" measurements for the rough opening dimensions of windows and doors (trim may...

jeffwired, thanks for the web site. thats the kind of information I was looking for.

smadave, I am a homeowner also needing a smaller furnace such as the 40K Carrier furnace descibed in this post. Could you point me to a web site that has the specifications on the 40K mxa model?

gtownguy,
I'm a homeowner in Charlotte area. Read my thread "On time for properly sized furnace". Contractor put in an 87K BTIH furnace in my house (approx 1714 sq ft) and its way oversized. Make...

dan sw fl,
"Heat pump in Charlotte NC is the most economical heating option."

Yes, I understand heat pump maybe more economical and I probably will go back to a heat pump when my current AC unit...

billva, I just read in my manual that the "manual fan on mode" sets the fan speed to the cool speed setting. Doesn't look like there's any additional jumpering to do. I may give that a try this...

greg o, no don't need 5 tons but currently have a 3 Ton system any my load calculation results were:
23,540 Sensible
4,895 Latent
which should be a 2.5 ton. I'll put up with a little oversizing...

billva, thanks for your response. I wouldn't mind running the fan all the time but its too noisy because the ducts aren't sized for the higher CFMs. When running the AC, it is much quieter because...

Freezeking2000, yes i see that option "0680" in the setup menu. Right now its set at the default 2. 1=less agressive temp control or 3=more agreesive temp control. Would you suggest option 1?

I...

These replies are great and I appreciate your input. Anybody got a hugh house that need a good used furnace? LOL...

jrbenny, I understand what you are saying and thats why I thought the unit was way oversized. I would prefer the longer on-heat cycles than the quick high burst of heating. Also, if I had a smaller...

Dave Davis, thank you for your reply. I believe this is an important topic to understand as a home owner. I've read on this forum that for a properly designed AC system and at the outside design...

deejoe; Sorry if I didn't mention whether it was too hot or too cold. The problem is that when the heat is on for that short time, I can really tell its Heat time and no wonder it only takes 7-8...