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could someone explain what the purpose of cold air return is?

i have a new furnace and i feel air leaking out of the connection between the furnace and the new duck work and the backing of the furnace. i was wondering if it would hurt if i put some tape over...

thank you

so you guys are trying to help? ok what is a manual j? who can i get to do it for me? how much does it cost? i will listen to you guys but there is so many different answers for the same question....

going with a 75,000 thanks guys. hope i am doing the right thing.

i am trying to figure out the right btu for my house 1600 sq ft. windows are 8 years old with r-25 insulation the the attic i don't know what is in the walls. i have trouble with my wash room not...

i meant registers

how many registers should i have with a 100000 btu and a 80 btu? i have 12 now and i was wondering if that is right for 100000 btu in a 1600 sq ft house-two story

[Edited by jerry1967 on...

how do i do this myself?

i have a 100 000 btu now but they are saying 7500 without doing a calc should i belive them?

btu- how do i know how many i need for a 1600 sq ft house

where can i get the calc load?

what is a load calc?

i am replaceing a magic chief with a armstrong i believe. i think i am going with a 90% with 100,000 btu. my house is 30 years old with fairly new windows. the one that is in the house now is a...

how do i get it from this work site?

how do i figure heat loss?

i was wondering if i should go with a two stage or a single? what is the advantage of the two stage?

what is wrong with their single stage 90% furnace?

i am buying a new furnace but i am confused about the btu. is a larger number better all the time? can i have to much btu? will the larger number btu get my house warm?

what is a good brand for a furnace? i was thinking either armstrong or trane.