there is one 32" insulated steel exterior door These are double pane casements that I assume meet MN energy code (U 0.35) there are two windows on the exterior (north and west) walls, 19 and 14 st ft, so 33 sq ft total. rooms are bedroom 153 sq ft, bath 38 sq ft, closest 11 sq ft, and hallways 50 sq ft space is 252 sq ft of floor, with ceilings at 8' 5", so about 2,150 cubic feet OK, here are the details of the space we need to heat, in case someone feels like doing a rough calculation: Give us accurate measurements of the room. Because it modulates, I'd go with a bigger unit. I also get a lot more than 6,000 BTU heat loss in the room you describe with my heat loss program. If I didn't live in Massachusetts, I'd be knocking in your door tomorrow at 8:00 AM. I'll need to do an IBR calculation with my Slant-Fin program.Ĭall another seller or check their web site for dealers. They listed all kinds of areas in Minnesota. There are a ton of these Rannai heaters where I work and in the winter, it blows so hard, it will blow the feathers off of a crow bar. My generic estimation of this room was 6,000 BTU's. (It wasn't an electric heater.) Go to the Rannai Web Site and click on warm air furnaces. I just filled it in with generic information based on a 16'X16' room and they had a recommendation for you. They have a heat loss calculator that you fill in the blanks with your information. I'd really like a gas room heater (wall unit) of some sort, but two HVAC guys have told us the space is too small. Operating costs will be high, but this option seems like 1/3 the cost of the others. small direct vent gas "stove": costly, questionable safety as main heat sourceĪnyone have other ideas? Or recommendations from among these options? Right now I'm leaning toward removing the PTAC and putting in electric hydronic baseboards, largely because I know we can drop 240v from the attic and the materials will be relatively inexpensive. small gas furnace in attic: ducted to this space, but will cost $3K+ by best estimate electric thermal storage (Steffes): bulky, costly, but qualifies for discount electric rate room-sized gas furnace: HVAC pro says the space is too small for product hydronic: costly, complicated install, space too small to justify adding a boiler baseboard electric: cheap, inefficient, ugly, noisy We have gas and power accessible to the addition, but the mechanical room for the house is in the basement so it would be hard to run lines and impossible to runs ducts from their without, say going through the unconditioned garage. The addition is on a slab and due to location we cannot connect it to the main house HVAC. I'd like to replace the PTAC with an alternative and do not necessarily need AC. The room hovers at 40F with no heat on in the winter as it shares two walls with the heated part of the house. I live in central MN so we see -25F occasionally each winter. I have a ~275 sq ft addition (bedroom, bath, hallways) that was built to code ten years ago it is currently heated/cooled by a PTAC that is noisy, ugly, and leaks cold air in the winter. I've asked my question in a few forums and have had three HVAC companies visit my house, but I'm still looking for options.
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