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I have read that it is not good to have a supply duct taken off the end of a trunk. That there should be 12-18 inchs of dead space at the end. Why is this? I took down the drywall ceiling in my...

The old furnace says 125,000BTU input and 100,000BTU output. So does that mean if this furnace running 24/7 would have a efficiency of 80%. 125,000 x 80%=100,000. Even if it is 37 years old? So when...

He is 1 1/2 hours away so I gave him my measurement (I have recheck them 3 times now) over the phone. He said he used a design temp of-17F. So the 2 report should have been close. I ask how much of a...

O.K. Now I am really confused. I had someone give me price on a York 9C. He did a heat loss calc and came up with 91000BTU. so he want to put in a 100,000BTU furnace 98%.He says he uses a program...

I found the Hvac-Calc very easy. the only problem I had was getting the right Outside Design Temp, a member was able to give it to me. Having the right outside design temp is very important.
Yes it...

I have managed to find a company that is willing to come out, will have to pay a small travelling fee but thats O.K. When I talked to them on the phone I asked about heat loss calc and they said that...

my first Calc was wrong. The proper design temp for Princeton is -17F not -30F that made a difference of 6500Btu. The Low-E windows made a difference of 3300Btu. And I changed from outside...

First I what to Thank You for helping me. I hope I am not being a pain. If I am I do apologize. The problem is that i live in a small town. The closes city is 75miles away and I am having a hard time...

Thank You

Do you measure inside or outside?
My house is 42x26 outside =1092 sq ft.
If I measure inside it is 25ft/4in x41ft/4in =1049sq ft.
I know that doesn't make to much of a difference but when I do the...

I used Dawson Creek only as a extreme. Because the HVAC-Calc Does not have Princeton B.C.. I live in Princeton B.C. and can not find anywhere what the outdoor design temp is.
Does anyone know...

Using a design condition for Dawson Creek B.C. (Canada) which is in the far north. I come up with 52,484BTU. I am in Princeton B.C. south interior mountain. the winters are not as bad as Dawson...

I do have new low e windows and r38 in the attic basement is r12 walls.
The Hvac-Calc was pretty easy to use except for the part about outside design temp.
Temp in winter get to -13F -22F...

I do have new low e windows and r38 in the attic basement is r12 walls.
The Hvac-Calc was pretty easy to use except for the part about outside design temp.
Temp in winter get to -13F -22F...

That is also one of of my concerns, the larger the furnace the more cfm.
I know that the furnace is a Modulating and it has a variable speed motor, But I still should not go to much oversize,...

I did a heat loss calculation using the HVAC-Calc from this site. I came up with Total heat loss 50,983 BTU. Would a 60,000 btu furnace be to small.I am looking at a Carrier 58mvc. 96% efficency....

First I used the Hvac-calc from this site.

I have some questions about set up and size.
I came up with 50983 BTU. So a carrier 58MVC60 should be good. Right?
Set up and adjustments, things to...

Thank You referrob

i understand it is important to get a good installer for a furnace and that they should calibrate the new unit once it is installed (as Jim has pointed out).I have not seen or heard of this. In the...

I need to replace my gas furnace. It is a 30 year old Furnsman brand. I am not going to ask about sizing or ducts because I will have a heat loss calculation done and I need to do some duct work so I...