New Goodman furnace install

[Jesse476]

After much thought I decided to go with a standard house furnace for my new shed. I have a Reznor hanging heater in the attached garage and am not a big fan. I mainly wanted something a little more quiet.

It's a 80% efficient 70k btu Goodman. With 30 feet of gas line and ductwork. they quoted me $1460. Seem reasonable? MY question is why cant they vent it horizontally. They are telling me vertical is the only way. I have no reason not to believe them but think there must be a way.

 

[csp]

MY question is why cant they vent it horizontally.

condensation in the flue pipe

 

[fabrk8r]

If it was a 90% or higher efficiency furnace it could be vented horizontally.

A 90% NG furnace will produce more condensate than an 80% unit, but they are designed to handle it by having the condensate run back to the unit and be drained off.

An 80% unit is relying on the heat of combustion to carry the moisture up the flu pipe.

 

[fabrk8r]

Double posted.

 

[kirk.g]

Im no expert but I can tell you that in Canada there are no more 80% furnaces.At least none can be manufactuered or imported.One HVAC supplier told me there are no mid efficiencies around.As far as I know the US.is going the same way check and find out the date I think its next year sometime.I guess what Im trying to say is make sure the guy isnt trying to unload his old technology on you.Look on ebay there are lots of Goodman furnaces 92% and above for not much more $.For that kind of money you should get a 2 stage high efficiency 92-95%........Kirk

 

[Jesse476]

Thanks for the replies.

Kirk-- The problems I have with the 95% efficient is 1)I would have to keep it on 24/7 so that it doesn't freeze up and 2)Not sure how much water would collect but I don't have a drain out there.

I plan on keeping it heated at 40 degrees all winter but I am already heating 5000 square feet so 6500 might be too expensive here in mn. especially if it's anything like last winter.

 

[kirk.g]

If you plan on minimum 40 deg then you shouldnt have a problem with freeze up?You might be able to create some sort of catch basin for the water and then just empty it manually on a periodic basis.Just wouldnt want to see you pay for a furnace that wont even be around in a year.....Just like cars this time of year, the dealer is going to want to clear the current stock and will try and give you a sales pitch.I know that 80% efu are now scarce here because no new ones are coming on the mkt (been close to 2 years now) I talked to a guy in PA. last week I can get a goodman 2 stage 46 thou btu 95% for 700$ if i pay cash......As you probably know they are direct vent so exhausting out the side of building is no problem............Im not a HVAC guy so there are many more knowledgable than I on here........thanks Kirk

 

[stevefasano]

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[kirk.g]

where are such prices available ie. 700$ for a new goodman?...thnks

 

[stevefasano]

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[stevefasano]

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[HVAC Phil]

where are such prices available ie. 700$ for a new goodman?...thnks

Wholesale pricing, not ebay pricing. Goodman will sell to anybody, they offer no price protection for their dealers.

 

[HVAC Phil]

After much thought I decided to go with a standard house furnace for my new shed. I have a Reznor hanging heater in the attached garage and am not a big fan. I mainly wanted something a little more quiet.

It's a 80% efficient 70k btu Goodman. With 30 feet of gas line and ductwork. they quoted me $1460. Seem reasonable? MY question is why cant they vent it horizontally. They are telling me vertical is the only way. I have no reason not to believe them but think there must be a way.

That seems like a very cheap price installed. 80% is more than adequate for a garage install, just be aware of burner height from ground since it isn't sealed combustion.

 

[jvitez]

Thanks for the replies.

Kirk-- The problems I have with the 95% efficient is 1)I would have to keep it on 24/7 so that it doesn't freeze up and 2)Not sure how much water would collect but I don't have a drain out there.

My dear old mom has a high efficiency NG furnace in her house. When running, the amount of water draining into her sewer drain is like a faucet on a slight trickle. Not a lot, but it certainly would add up to one big patch of ice if allowed to freeze.

Your quoted price seems, really really cheap to me. I was given a ballpark price of $3000 to install one NG hanging unit heater in my garage. Prices for HVAC seem to vary a huge amount depending on location.