Page 2 of 2 FirstFirst 12
Results 14 to 22 of 22
  1. #14
    Join Date
    Feb 2013
    Location
    New Jersey before and after Texas
    Posts
    65
    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread.

    You can find the rules for posting and qualifications here.

    Additional infractions may result in loss of posting privileges.
    Last edited by jpsmith1cm; 02-04-2013 at 10:02 PM. Reason: non AOP member

  2. #15
    Join Date
    Feb 2013
    Location
    New Jersey before and after Texas
    Posts
    65
    I am learning the forums, seems like to many rules

  3. #16
    Join Date
    May 2004
    Posts
    12,028
    Quote Originally Posted by Joseph'bidness View Post
    I am learning the forums, seems like to many rules
    Just in the AOP area and for a good reason.

    May want to avoid the AOP until you get your verifications to answer and hang out in the other forums for now.

  4. #17
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Your heating and cooling requirements are so minimal, I don't think you'll get much out of fancy equipment and controls. Just get a 2 stage furnace and single stage AC properly sized. Just a basic 2 stage thermostat will work fine. I like the Honeywell Focuspro for a basic thermostat since it has adjustable cycle rates. Unless you get a good utility or mfg rebate, I'd just put in a basic a 13 SEER unit as little as you'll use it. With a vairable speed blower on the 2 stage furnace, it will provide 14SEER anyway. Proper sizing or even undersizing it slightly if you're borderline will make a huge difference on efficiency.

    Modulating is nice, but a 45k BTU 2 stage will go jsut as low if you have a small load. The smallest modulating furnace is 60k BTU.

    IF you have a smaller house and a load under 40k BTU's I would encorage looing at a combi boiler and using a hydronic coil for heating. Then you have just a single appliance for hot water and heating and the water temp can be varied based on outdoor tmeprature, so the capacity of the system can vary all the way down to nearly 5% capacity.

  5. #18
    Join Date
    Mar 2006
    Location
    The South
    Posts
    2,197
    To add to the previous post.

    If you elect a two stage furnace, you want a true two stage thermostat that controls staging not relying on a timer that will leave you in high stage all the time whether needed or not.

    IMO

  6. #19
    I received the 3rd bid yesterday. This company did perform the manual J and came up with a requirement of 71,000 BTU and recommended a 110,000 BTU two stage. They felt with a little larger unit Does that seem reasonable based on the requirements from the manual J?

    I feel like I'm almost there...

    Thank you!
    Ryan

  7. #20
    Join Date
    Jun 2006
    Location
    Richmond, VA
    Posts
    2,916
    What's the cooling load?

  8. #21
    Great question - she didn't leave me with that data point. I haven't been interested in replacing the AC, so perhaps that is why she didn't provide it to me...

  9. #22
    Join Date
    Jun 2006
    Location
    Richmond, VA
    Posts
    2,916
    Quote Originally Posted by breaks911 View Post
    Great question - she didn't leave me with that data point. I haven't been interested in replacing the AC, so perhaps that is why she didn't provide it to me...
    It's relevant because the furnace needs the capability of covering the cooling cfm. With a heating load of 71000 a 90k furnace will do the heating load, as long as the furnace has a big enough blower to do the cooling load.

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event