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.
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A 50,000 BTU heater will heat up an 800 to 2,500 square feet. Upgrading to a 60,000 BTU will heat up a room up to 3,000 square feet.
The price of a 5,000 BTU heater will vary depending on the brand, and the features. You can find many of them for less than 100.00.
5000 BTU is the capacity of a standard "bedroom window" air conditioner. Say, a space 10X12.
A 35,000 BTU heater will heat a 10,000 square foot home.It is important to buy the correct size of heater for the home.