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Old 01-14-2009, 10:07 PM   #1
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Heating/cooling a wood shop


Ladies and gentlemen -
I'm interested in purchasing a heat/ac unit for a small woodshop (approx. 450 sq ft with 10 ft ceilings and good insulation). I think I have a handle on the size of unit I would need but am unsure whether to buy a packaged terminal unit like - http://www.grainger.com/Grainger/items/1CFA5 or a propane unit like - http://www.grainger.com/Grainger/items/4LX41 and a separate window type unit. The electric unit seems pretty straight forward but I am curious about the propane. What kind of venting (gravity vs powered) and blower/fan should I be considering given the presence of wood dust and such. I assume these can be installed so that it is vented outside as well as pulling in outside air to heat? I'm sure I'm not asking all the questions I need so feel free to fill in where I might have missed
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Old 01-15-2009, 05:56 AM   #2
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Heating/cooling a wood shop


the unit heater with the propane seems to be more user friendly with it general application.the ductless HP is a little over kill even though you get the AC side with it,and the dust/wood shop factor might be more of a headache.the heater will still burn some dust with the space heater air running over it,but blowing it out weekly will keep that at a minimum..the ductless will fine filter and with a wet AC coil during the summer become a bigger problem....might consider window unit in the wall remove to wash out seasonaly and during the winter to store.
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Old 01-15-2009, 07:27 AM   #3
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Heating/cooling a wood shop


Do you need it to be vented outside? You might be best off with a very cheap, NON vented gas heater. If that is the case look at PRo Com from Northern Tool. You will spend more like $100 than $700+. If you spend long periods of time in there, or are concerned about carbon monoxide or moisture, you might think about a Rinnai. It vents right outside the wall where it sits, pulls outside air for combustion so you know that the burner is sealed to the inside. Much more efficient, as well, than the 2nd item you linked above. A little bit more money, but well worth it I think. This is what a Rinnai looks like:

http://xj.cdevco.net/heat/rinnai.jpg

Heres the pro com

http://www.northerntool.com/webapp/w...2735_200332735

where are you located? how cold does it get? how warm?

Last edited by pcampbell; 01-15-2009 at 07:31 AM.
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Old 01-15-2009, 07:38 AM   #4
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Heating/cooling a wood shop


Do you ever use flammable chemicals in your shop, do you have a dedicated 220V circuit, and what are you electric rates (including taxes) and propane price/gal?
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Old 01-15-2009, 09:34 AM   #5
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Heating/cooling a wood shop


I would say that venting outside and the ability to draw outside air are important as it is likely that on any given day finishing vapors may be present. Im really not sure what the advantages of a non-venting type unit are? How is a rinnai much different from the dayton I posted. Both will do the job and both can vent outside. What are its advantages and what makes it more efficient?

As far as climate, I live in Tenn and we have pretty mild winters. Usually looking at the 40's to 50's during day and 20's to 30's for night. Sumers can be a bit warm in the low to mid 90's.
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Old 01-15-2009, 09:38 AM   #6
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Heating/cooling a wood shop


Didn't think to ask until you mentioned you do finishing work, but do you have a need to control humidity?
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Old 01-15-2009, 10:50 AM   #7
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Heating/cooling a wood shop


The one you posted is power vented, not direct vented. Direct vent is just easier and usually means the unit is more efficient. It will be as simple as drilling a 3" circle hole in your wall.

The one you posted uses room air for combustion, I think. I am not sure. You probablyt want to check on that. The Rinnai is sealed combustion chamber and definitely brings cold air in.

The advantage of non-vented is 100% efficiency, the disadvantage is moisture and carbon monoxide. I am thinking that by design, any non-vented units could be sealed .....since they use room air for combustion.

Not sure how electric rates compare to LP rates - you might look more into the advantages of that Friedrich?
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Old 01-15-2009, 12:37 PM   #8
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Heating/cooling a wood shop


Quote:
Originally Posted by dac122 View Post
Didn't think to ask until you mentioned you do finishing work, but do you have a need to control humidity?
In short yes. Not so much for the finishing aspect but primarily for the wood aspect. If moisture/humidity fluctuates too much then wood moves too much. I guess as far as control goes, I need to be able to maintain a pretty constant moisture level. Ideally were lookin at something like the typical residence in Tenn.
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Old 01-15-2009, 12:40 PM   #9
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Heating/cooling a wood shop


Quote:
Originally Posted by pcampbell View Post
The one you posted is power vented, not direct vented. Direct vent is just easier and usually means the unit is more efficient. It will be as simple as drilling a 3" circle hole in your wall.

The one you posted uses room air for combustion, I think. I am not sure. You probablyt want to check on that. The Rinnai is sealed combustion chamber and definitely brings cold air in.

The advantage of non-vented is 100% efficiency, the disadvantage is moisture and carbon monoxide. I am thinking that by design, any non-vented units could be sealed .....since they use room air for combustion.

Not sure how electric rates compare to LP rates - you might look more into the advantages of that Friedrich?
What exactly does power vented vs direct vented mean. Ideally I woudl rather not be circulating air from inside the shop. Can't see the advantage to having dust and fume filled air going over or through burner. Sounds like I definately want something vented then?
As for propane, costs about $2.75 a gallon for 120 gallon tank. People tryin to get me hooked up with 500 gallon tank! Lord I could heat for years!
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Old 01-15-2009, 12:48 PM   #10
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Heating/cooling a wood shop


Maybe I should start over and give you the logistics and you all can tell me what would be appropriate.

Average temp - Jan 30/47
July 69/88

Shop size - 18x24 w/10' ceilings with good insulation, two south facing windows and one east facing. Only one door which is fairly well insulated.

Would like to maintain about 60 in winter and 75-78 in summer. Will most likely adjust temp in shop accordingly when I'm not in there. As for humidity, would like to be able to maintain an average seasonal humidity somewhere along the lines of the normal residence. As for safety, I would prefer to not have flames exposed to fumes etc (I think Im saying that the right way). Will consider all types of heat but have some limitations when it comes to electric. 220/20A is the extreme. Certainly cant be hooking up any 440! Propane seems to be fairly expensive but not sure how to compare it with the cost of electric. That should cover it!
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Old 01-15-2009, 01:12 PM   #11
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Heating/cooling a wood shop


Since you want heating, cooling/humidity control, safety against open flame, modest OD temps year round, and your propane is pricey vice electric (can't be sure but you are in the TVA area, no?), it would seem a no-brainer to go with a PTAC or split system with electric strip backup. That's my $.02
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Old 01-15-2009, 01:37 PM   #12
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Heating/cooling a wood shop


Hi,
go here and have a look, i've installed a few of these in 1 & 2 car garages and they work very well, as for AC get a $100.00 5000 btu window unit from wal-mart and install it in a window or a wall sleeve, wahs the filter a few times a season and hose the evap coil out at the end of season.
You will not go wrong with this combo.

hope this helps.
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Old 01-15-2009, 02:01 PM   #13
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Heating/cooling a wood shop


Quote:
Originally Posted by dac122 View Post
Since you want heating, cooling/humidity control, safety against open flame, modest OD temps year round, and your propane is pricey vice electric (can't be sure but you are in the TVA area, no?), it would seem a no-brainer to go with a PTAC or split system with electric strip backup. That's my $.02
Yes. In the TVA. By PTAC I assume you mean a packaged terminal air like this - http://www.grainger.com/Grainger/items/1VXJ4 What makes this choice a no brainer? Sorry if I sound a bit ignorant...
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Old 01-15-2009, 02:02 PM   #14
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Heating/cooling a wood shop


Quote:
Originally Posted by evapman View Post
Hi,
go here and have a look, i've installed a few of these in 1 & 2 car garages and they work very well, as for AC get a $100.00 5000 btu window unit from wal-mart and install it in a window or a wall sleeve, wahs the filter a few times a season and hose the evap coil out at the end of season.
You will not go wrong with this combo.

hope this helps.
there was no link to view...
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Old 01-15-2009, 02:14 PM   #15
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Heating/cooling a wood shop


Poster above me forgot to add a link.

Direct vent means there is a pipe from the unit to the outside. Power vent means there is a pipe from the unit to the outside, that has a fan in it. Power vent is usually only required if there is a long distance between the unit and the outside. Not the case here.

It's really ok to have flames in the shop. But most people feel a little safer with electric. Since you've not yet bothered to give us an idea of what your electric vs propane rates are, we can't tell you whats most cost effective. But so far all signs are pointing towards electric heat. You really don't need a HUGE heater, living in Tennessee and all.

Having my own hobby shop, my opinion is you just need something that helps take the chill out of the air. Something that makes it comfortable to work in pants and a long sleeve shirt, once you get moving around a bit. So I think your 20 amp 220v service should handle your heating needs. Just get the biggest electric heater you can afford.

You may want to consider a humidifier if you have a water line handy. Will help keep the humidity up in the winter.

As for cooling, you have lots of options, from cheap window units, ductless split systems (which should be a good solution if you can afford it) all the way up to a small residential system (which you might be able to find used and be a good deal, but be careful of buying too big a unit which won't provide decent dehumidification).

Really one of the biggest constraints is your budget and exactly how much room you have available in your shop. You really need to make this decision yourself, IMO. You gotta be comfortable with the space your going to give up.

So things to think about - probably electric heat, humidity control both under heating and cooling, get a humidistat on your wall, consider an exhaust fan for finishing vapor removal, consider an air filtration unit (along with good dust collection, not in leu of it), and decide how much room you want to give up and how much money you want to spend.

If you are clever and handy, it may be possible to dream up a custom solution, even using used parts, that accomplishes all those things.
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