New Central Air/Hot,cool system?


  #1  
Old 08-07-02, 12:55 PM
mckra1
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Question New Central Air/Hot,cool system?

Please help,

I am trying to put a new central a/c and heating system into an old cape... Dimensions of main house 20x30 side porch 12x16. there is a non-doormered upstairs. I will be adding on a new addition, yet have to put the new system in the existing home prior to the fall and the new addition going up. the new addition will be 25x42 ground floor and 25x30upstairs, with raising the back portion of the existing structure. What size unit should I use? What size duct work should I use? should I use two units??? 1 furnace, 2 a/c units??? 2 furnaces??? how do you know where to place duct work and returns??? Please advise...
 
  #2  
Old 08-07-02, 01:47 PM
bigjohn
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You have to start with a room by survey of the existing heat loss/gain. At www.hvaccomputer.com you can buy, for $39, a one house version of the same heating/cooling load calculation program that contractors use. Include the addition in your calculations.
 
 

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