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 you know if your furnace is too big?

What size furnace do I need for a 2000 square foot home?

Rough Estimates

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.

Should you oversize your furnace?

The bottom line is that, yes, you SHOULD care about an oversized furnace. Furnace oversizing has been a common practice among heating contractors for as long as heating systems have been installed in homes, and is still rampant today.

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.

Why Your Furnace Might Be Too Big For Your Home - House-As-A-System

What size furnace is needed for a 1500 square foot house?

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. A 2,100-square-foot home will require between 65,000 to 125,000 BTUs.

Why are new furnaces so small?

Smaller Size

As furnaces have become more efficient, they have also become smaller. Because it can heat water faster, the boiler tank does not need to have a large capacity.

How many square feet can 80000 Btu heat?

80 X 1,000 square feet = 80,000 BTUs.

What size furnace do I need for a 2500 square foot home?

Determining the Square Footage

In colder climates, you'll want a furnace that generates 40 to 45 BTUs per square foot. At this amount, you'll need 100,000-112,500 BTU furnace to heat a home of 2,500 square feet.

What size furnace do I need for a 3000 sq ft home?

The general rule of thumb is that you want 40-45 BTUs of heat per square foot of your home. So, if your home is 3,000 square feet, you'll want a furnace that produces between 120,000 BTUs and 135,000 BTUs. The more BTUs, the more expensive the furnace.

What size furnace do I need for a 5000 square foot home?

Depending on your climate, you'll need 30 to 60 BTUs per square foot of the home.

Can a furnace be oversized?

Having a furnace that's too big for your space is extremely inefficient. There are two simple signs that indicate that your furnace is most likely oversized: Your furnace runs for a short period of time before shutting off. Your home has uncomfortable hot and cold rooms.

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 much is a new furnace for a 2000 square foot home?

The average cost range for purchasing and installing a gas furnace designed to heat a 2,000-square-foot home with a 97% efficiency rating ranges from $4,000 to $8,000, with most homeowners spending around $6,000 total on a high-efficiency gas furnace replacement in a 2,000 sq. ft.

Is it worth repairing a 20 year old furnace?

Furnaces 20 years old or older become increasingly inefficient over time and can crack and leak, putting you and your family in danger. If your furnace is between 16 and 20 years old and constantly breaking down, then you should strongly consider having it replaced.

Should I replace my 25 year old furnace?

The methods used by HVAC professionals to properly install and vent furnaces have even changed in the last couple of decades. So, if you're asking yourself if you should replace your 25-year-old furnace, the answer is a resounding yes!

How efficient is a 40 year old furnace?

How efficient is the average 35-40 year old furnace? 80% at best. Likely lower if it is indeed close to 40 yes old. A lot of savings to be had with a new furnace 95% with a ecm blower motor.

What size furnace do I need for a 2200 square foot home?

So if your home is 2,200 square feet, you'll need a BTU output between 99,000 to 132,000 to heat the whole space. This calculation may be confusing, but Blakeslee & Son can help. Our expert installers take the guesswork out of furnace installation!

What is the most reliable furnace brand?

How do I determine what size furnace I need?

How long do furnaces usually last?

A well-maintained furnace can last at least 15 to 20 years, but completing annual maintenance and being diligent with repairs can extend its life even longer.

Do you count the basement when sizing a furnace?

Your new furnace should have enough heating capacity to meet your current and future heating needs once you update your basement. If your basement is finished, that space needs to be included in your square footage calculation, even if you rarely use the space.