30,000–50,000 BTUs: Suitable for spacious garages or workshops (900 to 1,500 square feet) and provides high
For a 1 car garage with 200 sq ft to 300 sq ft, the estimated heater size is 15,000 to 25,000 BTUs. For a 2 car garage with 500 sq ft to 700 sq ft, the estimated heater size is 30,000 to 45,000 BTUs. For a 3 car garage with 750 sq ft to 900 sq ft, the estimated heater size is 45,000 to 55,000 BTUs.
To heat a 40×60 shop, which is 2400 square feet, you'll typically need between 108,000 and 132,000 BTUs.
Warmer climates along the southern part of the United States—considered Zone 1 or 2—require 30-40 BTU per square foot. The middle part of the country—Zone 3 and 4—require between 40-45 BTU per square foot, while the northern areas of Zone 5 need up to 60 BTUs per square foot.
Heats up to 950 sq. ft.
To heat an average two car garage, you'll need a garage heater that is capable of heating roughly 6,000 - 9,000 cubic feet of air. We recommend getting a 30,000 - 50,000 BTU garage heater to get your two car garage to a comfortable temperature.
How much does a 40x60 concrete slab cost? An installed 40x60 concrete slab (4 inches thick) for buildings will typically cost between $9,600 and $19,200. A 4-inch slab will usually cost between $4 and $8 per square foot (depending on your location) for materials and labor.
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.
Total Cost Estimate = $155,000
So in total, a basic 40×60 shop house shell, foundation, standard workspace, and reasonably finished 1200 sq ft residence would cost an estimated $155,000.
Generally, 50,000 BTUs are needed to heat a 3-car garage or a new generously sized workshop.
A fire pit generating up to 50,000 BTU will be very warm if you sit close to the table and can heat up an area between 675 sq ft and 700 sq ft. The distance from the 50,000 BTU fire pit at which you will feel comfortably warm on a cold evening outdoors is between 8 and 10 feet.
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.
Properly sizing your garage heater to your specific room size and type is an important step in optimizing comfort and reducing energy waste. A garage heater that is too large for the space will not heat the space more quickly.
Best mini-split air conditioner size for a two-car garage
A small one-car garage requires a 6,000 or 9,000 BTU mini-split, but the higher the garage's dimensions, the larger unit is required. Two-car garages require a more powerful mini-split at 9,000 to 12,000 BTU.
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.
Calculating Your Garage Heater Size
Watts are easy enough to follow as they can be quantified by 10 watts per square foot of space. For example, in an area that is 20 feet by 24 feet you would need 4800 watts of power (it's just the total square footage, 480, multiplied by 10).
How much does a 30x40 concrete slab cost? The average cost is $4 to $8 per square foot. The median price is about $6 per square foot. Based on these averages, you may pay $4,800 to $9,600 with a median estimate of $7,200.
In reality, a 40×60 metal building is a substantial structure with a total area of 2,400 square feet. For comparison, this is about the size of an average family home. One major benefit of using a steel building is the potential to optimize square footage.
Final Cost of Insulating a 40'x60' Steel Building
After you factor in the costs of materials and the costs of construction, you'll find that it will run you between about $2,400 and $6,600 to insulate your 40'x60' metal building.
In-Surface Radiant Heat
Unlike other heating methods, it heats a surface, rather than the air around it. In-surface radiant heat is one of the most efficient ways to heat a garage. Pros: Versatile option that can be installed in your garage floors, walls, or ceiling.
As a general rule of thumb, a 20 lb propane tank will last for approximately 10-12 hours when used for heating purposes at a rate of 30,000-40,000 BTUs per hour, depending on the heat setting.