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  1. #1
    Join Date
    Jun 2005
    Posts
    11

    Question

    I'm told I need to replace my central air equipment in a 2200sq ft Connecticut 2 story because of it's age and am also adding 650 Sq ft by converting the over garage attic to a bedroom.
    Current equipment: Rheem ROHB-095A heating and Rheem RACC-042JAS cooling. The furnace is cracked and will cost $1800 to fit new parts.
    I've had 4 HVAC contractors qoute on replacing the equipment. The general consensus is a Thermo Pride OL11-105 furnace and American Standard Allegiance 14 2A7A4042A1000A (3 1/2 ton) condensor and TXH042C4HPC A coil with 2 zone damper.
    Only one contractor did a Manual J calculation or took measurements so I was leaning towards him for his effort. This person also said the J calculation showed my existing ducts could be extended to heat and cool the new attic area. The other contractors said it wouldn't and said I should use a ductless system for the new area and baseboard heating.
    Now the kicker. When I asked the Manual J contractor yesterday if he was sure the airflow was sufficient to service the attic bedroom he said (I think) the CFM to the upstairs of the house would be 900CFM and current usage was 700CFM so the system would have to be tweeked by trial and error to make it work correctly and couldn't promise that it ever would.
    PLEASE HELP: Where do I go from here? I don't want to just replace my equipment, I want a system that works!!!



  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,084
    Usually the guy that took the time to do it right is correct. But even if you can use the existing, often an added on room isn't comfy just because its needs are different from the rest of the house. So even if you can...maybe that isn't the best idea.

    The Allegiance 14 without a A-S variable speed blower won't reach 14 SEER. You'll probably be closer to 13 SEER.

  3. #3
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Consider a "zoned damper " system,stats in both areas.

    Find a contractor that can do the Man J,and the Man D ,to size it and design the ducts properly.


  4. #4
    Join Date
    Mar 2003
    Location
    PA/DE area
    Posts
    1,535
    Near Danbury?????
    It's NOT the BRAND,it's the company that installs it!!!!!

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