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btus needed to heat & cool 625sf room
5000 BTU's should work for a room that size.
how many square feet does a 14,000 btu heater heat
36000 Btu
5000 BTU is a tiny amount of cooling - are you sure you don't mean 50,000 BTU? A 5000 BTU might give you a drop of 5 degrees C in a 6' x 8' office with no south facing windows, as long as the ceiling isn't too high. For a normal 10' square room, 12,000 BTU is a more reasonable starting point, then add more for sources of heat gain in the room.
800 sqft
usually around 400sq. ft room give or take
If measuring heat, a BTU measures the amount of heat that is required to raise the temperature of a pound of water to 1º Fahrenheit. In terms of air conditioning, the BTU determines the amount of heat the unit can remove from the room. As the BTU rating increases, so does the size, weight and cost of the unit.
A heat pump with an output of around 6,000-8,000 BTUs would be sufficient to effectively heat a 200 sq. foot room. It's important to consider factors like insulation, ceiling height, and climate when determining the appropriate BTU capacity for a heating system.
btus needed to heat & cool 625sf room
650 square feet
30000 btus for every 400 square ft
30000 btus for every 400 square ft
800 to 1500 BTU's
Yes, a 14,000 BTU furnace will heat your 500 square foot room just fine. Make sure you test it out to make sure you don't turn it up too high at first.
There is a lot more to it than square footage. To find out the heat load on any room or home you need to have a load calculation performed. This is a process that takes into account location, construction features, etc. With a portable heater (which is what you're talking about if it's 5,000 BTU), you can estimate heating ability with the 10 - 15 watt per square foot rule of thumb. So, 1,500 watts (5,120 BTU) will heat about 150 - 225 square feet. To go from watts to BTU, multiply watts by 3.4.
Rule of thumb, around 300 sq ft give or take.