1,500-square-foot home would take between 45,000 and 90,000 BTUs. 1,800-square-foot home would take between 55,000 and 110,000 BTUs. 2,100-square-foot home would take between 65,000 and 125,000 BTUs. 2,400-square-foot homes would take between 75,000 and 145,000 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. A 2,100-square-foot home will require between 65,000 to 125,000 BTUs. A 2,400-square-foot home will require between 75,000 to 145,000 BTUs.
For an Entire House
However, as a shortcut, most HVAC experts agree that you need a 1.5-ton (18,000 BTU) unit for a 1,000-square-foot space, a 2-ton unit for a 1,500-square-foot home, and one additional ton for every 500-square-foot increment.
How many square feet will an 80000 BTU furnace heat? A furnace with 80,000 BTU capacity can effectively warm up a typical home measuring 2,000 square feet.
Homes measuring 1,000-1,500 square feet: You'll need a 2-ton unit, which corresponds to a cooling capacity of 24,000 BTUs per hour. Homes measuring 1,500-2,000 square feet: You'll require a 3-ton unit, equivalent to 36,000 BTUs per hour. Homes measuring 2,000-2,500 square feet: A 4-ton unit is necessary.
Even a slightly undersized furnace will accomplish the job the majority of the time. Taking things down a few sizes will more than likely solve some of your common heating problems like too high of a utility bill while half of your house is blazing and the other half is an icebox.
30,000–50,000 BTUs: Suitable for spacious garages or workshops (900 to 1,500 square feet) and provides high heating capacity for colder climates or larger, less insulated areas.
For a moderate-sized home (around 1,500 sq ft) with a minor repair on a mild day (around 75 degrees Fahrenheit), you might expect your house to cool down within approximately 3 hours.
However, the truth is an oversized system will not do a better job of cooling the house or provide any extra comfort over a properly sized unit. Air conditioner size is calculated in BTU (British Thermal Units) and tons, and measures how much heat the system can remove from the home in one hour.
The Temperature Outside
Most central air conditioners can cool a moderate-sized (3 to 4 bedroom) home by about 5 degrees every 3 hours. This means while it can take no more than a couple hours to lower the temperature to a comfortable range in the fall or autumn, it can take much longer in the summer.
An oversized furnace causes excess wear and tear, higher energy bills, and more problems (and expenses!) that make it tough to stay warm in the winter. This article goes over how to tell if the furnace installed in your home is too big.
If your space is 300 square feet, you want to find a model capable of producing at least 6,000 BTUs. As a guide, consider 5,000-BTU models for rooms 150 square feet or smaller, 8,000 BTUs for medium-size rooms (340 square feet), and 12,000 to 14,000-BTU models for rooms with square footage from 550 to 800.
Since an oversized AC is too powerful for your home, it will quickly cool your home then shut off, which can raise your energy bills and wear out your AC (from all the starts and stops).
No, you should not put a bigger blower motor in your furnace.
The more BTUs a furnace has, the larger the area it can heat. However, bigger isn't always better. If your furnace has insufficient BTUs, it'll work non-stop and never keep your home at a comfortable temperature. Alternatively, a furnace with too many BTUs will frequently cycle and be inefficient.
While there is no specific formula for this, the general rule of thumb is 20 BTUs per square foot you are cooling. So, if your home is 1,500 square feet, you'll need an air conditioner with 30,000 BTUs.
First, the basics. SEER stands for Seasonal Energy Efficiency Ratio or “Rating.” This is the ratio of the cooling output of an air conditioner and heat pump over a typical cooling season, divided by the energy it uses in Watt-Hours.
1,400-1,600 square feet: A 24,000 BTUs (2 tons) AC unit is recommended. 1,600-1,800 square feet: Look for an AC unit with 27,000 BTUs (2.25 tons) for effective cooling. 1,800-2,000 square feet: A 30,000 BTUs (2.5 tons) unit is ideal for this square footage.