How many BTU furnace do I need for a 1000 square foot house?

A basic rule of thumb is that it takes 30 BTUs for every 1,000 square feet. At the most basic level, if you have a 1,000 square foot house, you'll look for a furnace that has 30,000 BTU output.

How many BTUs does it take to heat a 1000 square foot house?

Calculating the number of BTUs needed to heat an area

For example, a 300 square foot room typically requires 7,000 BTUs to maintain a comfortable temperature, while a 1,000 square foot room requires 18,000 BTUs.

What size furnace do I need for a 900 sq ft house?

For a space of 800 to 900 square feet, such as a small home or two-bedroom townhouse, the recommendation is between 30,000 and 45,000 BTUs. An average 2,000-square foot home will need between 80,000 and 115,000 BTUs to heat efficiently.

Is it better to undersize or oversize a furnace?

It's better to be a little undersized than oversized, You'll get a little longer run time, but it's better than shortcycling.

What size furnace do I need for a 1200 sq ft house?

A 1,200-square-foot home will require between 35,000 and 75,000 BTUs. A 1,500-square-foot home will require between 45,000 to 90,000 BTUs. A 1,800-square-foot home will require between 55,000 to 110,000 BTUs.

Step 1 - Sizing a furnace or air conditioner

How many BTUs do I need to cool 1000 square feet?

You'll see that 1000 square feet of space needs about 20,000 BTU for cooling. Some window air conditioners deliver 20,000 BTU. For mini split or central air, you'll have to decide on whether to go a little small at 1.5 tons or 18,000 but or go up to a 2-ton, 24,000 BTU system.

What happens if your furnace is too big for your house?

An Oversized Furnace Causes Your System To Short Cycle

When you have a heating system that is too large, your thermostat will read a higher temperature. Consequently, your furnace will turn off too soon to heat the rest of your house. This dilemma is referred to as short cycling.

How do I determine what size furnace I need?

Does higher BTU use more electricity?

The more BTU your unit produces, the more energy it consumes. So, if you are worried about high energy costs, you should get a unit that is appropriate for your space.

What is the difference between 12000 BTU and 14000 BTU?

In our experience, a 12,000 BTU portable can work well in a bedroom up to about 200 square feet, and a 14,000 BTU unit will make some difference up to 400 square feet if you can tolerate the noise.

What size furnace do I need for a 1 500 square foot home?

Generally in a Californian climate you will need 25-30 BTU per square foot. BTU is a measurement of a furnace's heat output. 1500 sq feet by 25 BTU gives us a 37,500 BTU furnace.

How many BTUs do I need for a 900 square foot garage?

Calculate the BTUs You Need

As a basic rule, the figure will be between 30 and 60 BTUs per square foot.

How big of a house can a 60000 BTU furnace heat?

A mid-sized home of 2,000 square feet would need approximately 50,000 to 60,000 Btu to heat it properly. With a less efficient furnace operating at 80 percent efficiency this would require a 60,000- to 72,000-Btu furnace.

What happens if your furnace is too small for your house?

When furnaces are too small, they'll have to kick on often—or even non-stop—try to increase your indoor temp. They end up running and running, but without any real progress. This leads to excessively high energy bills, and not much help in making your home comfortable.

What happens if you have too much BTU?

A unit with too many BTU's, will cool the room fast, but leave the room humid. Too few BTU's will never cool the room down and the unit will run incessantly.

How do I know if my furnace is too big?