Kerr Wood Furnace Reviews
"As Stated More Info is Needed"
As stated more info is needed to answer this question. However I will give you some general info on both appliances so you can make a decision. If you have a relatively new non-vented heater, built within the last ten years and has an oxygen depletion sensor (ODS) on it I would have no problem using them. They are the most efficient form of gas heat there is. The efficiency is well above 90% and a standard forced air furnace or a vented space heater will be nowhere near that. That being said, it is hard to say which will be better. If you have a central furnace with duct work going through out the house, you will keep every thing comfortable. A space heater will heat just that, a space. If you leave doors open and have ceiling fans you can circulate the air some what but not nearly as well as the central furnace. In the event you decide to use the non-vented heater, be sure it is installed in a living area not a bedroom or a bathroom. Be sure you leave a window in that room cracked, preferably nearest the heater. I don't care how cold it is outside, it needs to be open. Not wide open, just cracked so as to allow oxygen into the room. Never use towels or anything else in an attempt to keep the heat from escaping under doors and any other openings. Hope this helps in your decision.
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