HVAC Question

[95mustang302]

I'm in the process of buying a house. The house just had a brand new gas furnace installed in February, and unfortunately they vented it through the chimney. I was hoping to demo the chimney for the extra lil space in the kitchen.

This is a link to the tech specs on the furnace, and I just was wondering from the HVAC guys on here whether this particular furnace can be vented out the side of the house?

http://www.concord-air.com/pdfs/rcg80-100.pdf

Thanks!!!

[88Nightmare]

id recommend sending awesomeears a pm on here, he does HVAC and is very good at what he does

[95mustang302]

thanks, I was trying to remember who it was on here

[SSDude]

While it's a good furnace it's only 80% efficient. If they new they were selling they went the cheaper route.
You'll have to vent through the chimney. Your exhaust gas will be to hot for PVC. If it was 90-95% efficient you could use the PVC out the wall.

[jbiscuit]

If it was 90-95% efficient you could use the PVC out the wall.

what he said. Sorry man, you are SOL I think. Unless you start saving for a new unit

[95mustang302]

ahhh, i see, on that note, would it still be possible to do a "smaller pipe through the wall vs keeping the old chimney like in some houses built in the 90's, right beore the HE became mainstream?

[SSDude]

I'm guessing a bit here but you would probably be required to run the pipe up the side of the building to above the roof line. i know you have to do that with wood burners. Depending on where you live you might be required to use a double lined pipe. I know here in West Allis the code requires double lined vent pipe for low efficiency gas water heaters so the same may be true with the furnace.
Again Brad (Awsomears) has the knowledge and can tell you positively what you can or can't do.

[awsomeears]

I'll be honest here bud, that is the cheapest furnace out there !!! If you want to demo the chimney you need to get a 90% furnace installed that vents out with PVC.

Typical Temps out of your furnace are around 289-325 if I remember correctly, with a 90% furnace that vents out with PVC your talking 100-110.

Right there is simple math that 90% furnaces are better, your talking over 200 degrees that the cheap furnace wastes out of your chimeny.

That furnace was put in most likely to fool you by saying " Hey new furnace in here " is it wrong no no not at all. I'm sure the previous furnace was ancient :P

I'm guessing you have an electric hot water heater or a power vent that does not need a chimney.

Personally depending on the square foot ( get back and let me know ) I would have a 90% furnace installed and sell that current furnace on craigslist for a few hundred as a Garage furnace because that's all there good for.

Being totally honest here........

I can get you a furnace quote if need be, PM me bud.

:)

[Lash]

Throw that piece of junk in the garbage and get a 90%er.

[95mustang302]

Ok, got the idea, I understand its not the greatest unit, but it is brand new and will do the job for now. I don't need to spend a ton of money on a new furnace the minute I move in to replace something that's barely been used 6 months. Thanks for the advice though...

[awsomeears]

Ok, got the idea, I understand its not the greatest unit, but it is brand new and will do the job for now. I don't need to spend a ton of money on a new furnace the minute I move in to replace something that's barely been used 6 months. Thanks for the advice though...

Really we are pushing this because if you want to demo your Chimney that furnace needs to come out, if not by all means use the furnace.

What is the sq. ft of the home ?

[95mustang302]

house is only 800 sq ft or so, there is nothing wrong with the chimney, it was just a thought I had

[Lash]

Central air? How old?

[awsomeears]

house is only 800 sq ft or so, there is nothing wrong with the chimney, it was just a thought I had

If its 800 sq. ft that furnace should be just fine as far as heating BILLS !!!

The question is how large is the furnace, if you can take the cover off and it should say BTU 00,000 ?

40,000 or 50,000 should be fine in that house.

What would be wise in your position is to update the insulation, sill plates and make sure its a draft free house.

What city is the house in ?

[awsomeears]

When I mean fine I mean the bills won't be as much as a 1200-1400sq ft home. Still they will be pricey but that's up to you.

I just hope its sized right, if not then open up your Wallet

[95mustang302]

House is in waukesha the model number I got off the inspection indicates 50k btu and I got the rolling 24 month average of energy bills was under 100 a month

[awsomeears]

Sounds like the furnace is sized right witch is very important, since the home is smaller you should be good to go.

I recommend tune-ups on that furnace every FALL for sure, the way they are designed they get filthy in a year.

[Lash]

Sounds like the furnace is sized right


Technically, a square footage estimate can get you close in size, the only CORRECT way to size equipment is to do a load calc.
I'm pretty sure you already know that though. :thumbsup

[Korndogg]

I'm pretty sure you already know that though. :thumbsup


I'd hope so. But them non union boys don't get all the training we do :goof

[awsomeears]

LOL !!!

Yes I know this ladies.....