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Zinger 01-26-2009 01:41 PM

HVAC Options for 700 sqft?
I am planning an addition above my garage. It will be 33'x23'.

I am curious what HVAC options exist for a space of this size. Let me rephrase that...what COST EFFECTIVE options exist.

My initial thought was propane wall heater (I have propane heat in the house) and a wall mounted A/C unit. I figured these would both be the cheapest solutions. Now I am wondering if any manufacturers make units that would be cost effective for me to do "central" type heating for this space (units located remotely and ducting to move the air.

Any ideas are appreciated.

Scuba_Dave 01-26-2009 01:55 PM

I'm building a 24x36 garage w/great room over it (864 sq ft)
I'll be using a 24k BTU AC in wall
But we rarely use AC - maybe 2 weeks total in days during the summer

Zinger 01-26-2009 02:00 PM

Hey Dave, thanks.

What kind of AC unit is it? Is it going to provide heat as well? Electric?

Scuba_Dave 01-26-2009 02:06 PM

It's electric AC - 240v - requires 30a double pole breaker
It was only like $50 more then the 18k unit so I thought what the heck. It was installed at my last house & kept 900 sq ft cool - poorly insulated w/flat roof (hot in the summer)

It does not provide heat
We will have a Soapstone wood stove out there which will eventually (I think) be upgraded to a pellet stove. I'll also have a solar heating system. The main heat will be via forced hot water - going with radiators like the rest of the house instead of baseboard
The great room is 40" higher then the existing 1st floor, so heat will rise into this room from the adjoining sunroom/kitchen

Where are you located? Insulation in the room, walls etc?
That will all play a big role in what is recommended by the Pro's

Zinger 01-26-2009 02:16 PM

Funny you should mention a soapstone wood stove - I am doing the same thing!

Great minds must think alike. :thumbup:

Which one are you looking at? Right now I have the Woodstock Keystone in mind.

Anyways, the stove is why I was thinking about doing the simple propane and wall AC units. My only concern was that the AC unit might be loud.

beenthere 01-26-2009 03:29 PM

Get a mini split heat pump with low ambient ability installed.
You may want to have some baseboard installed if you ever have any days that the outdoor temp drops below 0.

Much quieter then a through the wall unit.

But, they don make Heat pump PTACs, that also have an electric heater in them, that you could use also.

jogr 01-26-2009 03:30 PM

Is this one big 700 sq ft room or several smaller rooms? Have you considered getting a heat load calc done?

Scuba_Dave 01-26-2009 03:54 PM

This is the Woodstock Fireview Stove installed at my last house
I built a raised hearth, the wall already had cement board (on strapping) from a prior owners stove. I built the brick work, acted as a passive heating system for air flow. The brick/cement would heat up & draw cold air from under the raised hearth. Hot air would flow out 2 opening in the top of the brick work

The hats & stuff were ONLY up in warm weather when the stove was not in use. Yes - I know there is a Christmas stocking up, this pic was taken after installation was completed & extra stove pipe added on the roof. Notice how clean it is inside? It could get up to 450 degrees, catalytic converter included. Very nice stove, 12+ hour burn time

Zinger 01-26-2009 03:55 PM


Originally Posted by jogr (Post 219552)
Is this one big 700 sq ft room or several smaller rooms? Have you considered getting a heat load calc done?

One big room. Well insulated.

Does anybody know if they make a combo propane / AC PTAC unit? I'd like to stick with propane since it's cheaper than electric.

Zinger 01-26-2009 04:09 PM


Your Fireview has exceptionally nice marbling on the stone. I love that stove in the blue, since it compliments the stone so nicely. I originally looked at the Fireview but it's just way overkill for the space I want it for. The Keystone will be a better fit, I think.

I currently have a Jotul Oslo in the house, in enameled blue/black. As much as I love blue, I think I'm going to go with the metallic brown color for the Keystone. If it's overkill, I have a possible plan to run some insulated duct with an inline fan to pull heat out of the addition and pipe it into the existing house, but I'm waiting to see just how well it heats the space. Given that it is over an unheated garage it will require more BTUs than if it were on a slab or over a crawlspace. My basement stays at about 50 degrees but my garage gets below freezing.

How is the paint holding up on your Fireview? Any fading or other problems?

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