HVAC for a Tiny (352 sq.ft.) house

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Old 06-28-19, 09:50 AM
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Question HVAC for a Tiny (352 sq.ft.) house

I did't see a category for some general HVAC questions, so I'm posting my questions here hoping they can be answered (I'm open to not just gas heaters). I am designing a tiny house that has an interior area of 352 sq.ft. It has three separate spaces : 99 sq.ft. office area, 23 sq.ft. bathroom, and 230 sq. ft. main area. the tiny house has a crawl space. I was thinking the crawl space would be on the inside of the insulation envelop. The tiny house also has 8' ceilings in office and bath areas and a cathedral ceiling in the main area with no space for ducts in the cathedral ceiling. I would like even conditioning throughout -- do not want to have cold/hot areas in rooms, but I also want the most economical way to heat and cool the spaces. I would prefer to heat using propane, but I am open to other solutions as well. What are some options I have for doing this in zone 3 (40-45 BTU / sq.ft.)? I can give more information such as type of insulation and window area if needed. I would like to be able to list a type of system, be able to draw it's footprint, and show the size and type of space needed in the floor plan.
 
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Old 06-28-19, 10:08 AM
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Mini splits were my first thought but they are electric so you wouldn't be able to heat with dinosaurs. Because it's so small I wonder if an RV (camper) HVAC system would be appropriate. Most of them heat with propane and have air conditioning. I just don't know their efficiency and whether or not they are approved for non-mobile structures.
 
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Old 06-28-19, 09:41 PM
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RV heaters heat with propane but most are strictly that..... heaters.Typically the A/C units are on the rooftop. Some of the bigger RV's use a combo unit but that needs to be ducted.

Based on your setup and lack of room.... a mini split heat pump or a PTAC might be the only way to go.
 
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Old 06-30-19, 06:56 AM
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How about a traditional forced air gas furnace and AC unit that allows LP conversion? what is the smallest size those come in? I have only seen as small as 40,000 BTU units, but I would only need about half that, if even that, I am guessing. I would think one of these units would distribute warmth/coolness more evenly without having areas not covered such as in the bathroom area, and would also be quieter since the units are concealed/outdoors. Not as inexpensive to install as a mini split, but still affordable, I would think, especially for such a small house.
 
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Old 06-30-19, 08:42 AM
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It would be way to big, and therefor have a very short life from over cycling.
Propane can be very expensive to heat with. I don’t recommend it as a primary heating source.
I’d look into a minisplit heat pump with electric baseboard as backup heat.
 
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Old 07-02-19, 04:23 AM
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One good quality wall mount ductless split should heat and cool that area well.
 
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