are 36000btus enough heat for a 1425 sq foot home

[salv97]

or would 49000 btus work better,i live in phila pa,have good insulation,can 36000 btus be sufficent

[Moose]

If a heat loss hasn't been done... must do that first. 36M could be too much, 49M could be too little. What about a/c? Your contractor/installer must do the math first.

[Tommy1010]

At a glance, it should be .... if all variables fit the picture. but who knows.

My house is only 5 1/2 yrs old and I have a friggin 5 ton system in it?

It works great but Im not sure if a load calc was done during construction or if they just winged it.

Returns were way undersized and I had to add. Trunk doesnt reduce at all which is a possible airflow velocity factor.

Lots of things can help or hurt efficiency of any unit.

[heaterman]

Only manual J knows for sure

[Irishmist]

Load calculation must be performed in order to determine the proper size required for maximum efficiency and comfort. There are no shortcuts.

Irish

[BaldLoonie]

Now Irish, you didn't tell them about the easiest method of heat loss calcs.

You stand across the street from the house. Hold your hand in front of your face. The number of fingers it takes to cover the house is the number of burners you should have in your furnace.

::DD:::DD:

About as accurate as anything else out there except a Manual J!

[Tommy1010]

Now Irish, you didn't tell them about the easiest method of heat loss calcs.

You stand across the street from the house. Hold your hand in front of your face. The number of fingers it takes to cover the house is the number of burners you should have in your furnace.

::DD:::DD:

About as accurate as anything else out there except a Manual J!

lol..I never heard that one. What if you live on a 4 lane highway. Across the street is a far way. You do that, you may end up with 1/2 a burner.

[Roadhouse]

or would 49000 btus work better,i live in phila pa,have good insulation,can 36000 btus be sufficent

The Man J is an analysis of how many btu's per hour your home loses. Simply put, whatever that loss is of a your home strictly determines the btu output of a unit needed so without a Man J performed to factor the btu loss of your home no one can really tell you anything.

[tinner73]

he purchased a furnace himself...asked us if it was over sized..we all tell him it is...then he explains why it isn't.

don't waste your time on this moron.

http://hvac-talk.com/vbb/showthread.php?t=582202

http://hvac-talk.com/vbb/showthread.php?t=576032

http://hvac-talk.com/vbb/showthread.php?t=568722


http://img39.imageshack.us/img39/3773/wtfgifs13.gif
i found a pic of salv97

[tedkidd]

How leaky is your house?

[zzonko]

http://piczasso.com/i/lu2na.jpg (http://www.imagehosting.com/)