Tagged: BTU

Sunglo Surface Area Guide

Sunglo Greenhouses Surface Areas-

This post is a supplement of a previous post for determining the heating or BTU requirements of your greenhouse – Click here to read the Greenhouse Heating post.

The following are approximate surface area’s of each Sunglo greenhouse series.

1000 Series - Surface Area

  • 1000 Series – 7′ 9″ Width

Model                Surface Area

7.5ft – B                     228

10ft – C                      276

12.5ft – D                   324

15ft – E                      372

17.5ft – F                   420

For every 2.5ft after model 1000F add 48 to the surface area.

1200 Series - Surface Area

  •  1200 Series – 10′ 3″ Width

Model                Surface Area

10ft – C                       338

12.5ft – D                    392

15ft – E                       446

17.5ft – F                    500

20ft – G                       554

For every 2.5ft after model 1200G add 54 to the surface area.

2100 Series - Surface Area

  • 2100 Series – 15′ 3″ Width

Model                Surface Area

10ft – C                     484

12.5ft – D                  549

15ft – E                     614

17.5ft – F                  679

20ft – G                    744

For every 2.5ft after model 2100G add 65 to the surface area.

1500 Series - Surface Area

  • 1500 Lean-To Series – 5′ 1.5″ Width

Model               Surface Area

10ft – C                    169

12.5ft – D                 196

15ft – E                     223

17.5ft – F                  250

20ft – G                    277

For every 2.5ft after model 1500G add 27 to the surface area.

1700 Series - SUrface Area

  • 1700 Lean-To Series – 7′ 7.5″ Width

Model                Surface Area

10ft – C                    242

12.5ft – D                 275

15ft – E                    307

17.5ft – F                 340

20ft – G                    372

For every 2.5ft after model 1700G add 33 to the surface area.

If you are a customer with a custom style Sunglo or have a discontinued series or just have questions please give us a call at 1-800-647-0606.

Greenhouse Heaters – Which One Is Right For You?

Greenhouse HeaterGreenhouse heaters. Electric, natural gas, propane and many more. But which heater is right for your greenhouse? How do you find out? This is where BTU’s (British thermal units) come in. To find the best heater for your greenhouse you must know the number of BTU’s required. And I am going to show you how to determine it!

Here are a few simple steps to find your BTU requirement.


  • STEP 1

You need to know the surface area of your greenhouse. This is not simply multiplying the length and width. You must calculate the area of each wall and each ceiling panel then add them all together. If you have a Sunglo greenhouse click here for Sunglo’s Surface Area Guide post.

  • STEP 2

Next you need to find out the average winter temperature (outside) in your area. This is where the internet comes in handy. But I made it easy for you > Click here to view a list of average temperatures in the U.S.

  • STEP 3

Now what temperature do you want to keep your greenhouse at in the winter? This depends on the plants you are growing. You should be able to find plant temperatures online. But a common minimum temperature for over wintering is 50°F.

  • STEP 4

The next step is finding your greenhouse’s U-Value or Heat Transfer Coefficient. This is determined by the material your greenhouse is made of. For a Sunglo greenhouse we use a U-Value of 0.75. To find your specific materials U-Value > Click here for a general list.

  •  STEP 5

Now that you have completed the first 4 steps you should have –

  1. Your greenhouse surface area
  2. Average winter temperature
  3. Desired greenhouse temperature for the winter months
  4. Your greenhouse material U-Value

Now we can find our required BTU’s!

And here is the formula –

  • Desired greenhouse winter temp – Average winter temp outside  = Temp differential
  • Surface area × temp differential × U-Value = Required BTU

For example:

My greenhouse surface area is 744

My average winter temp is 20°F

Desired greenhouse winter temp is 50°F

Sunglo acrylic U-Value is 0.75

  • 50° − 20° = 30° (Temp differential)
  • 744 (surface area) × 30 (temp differential) × 0.75 (U-value) = 16,740 BTU’s

Now you can shop for a heater that provides at least 16,740 BTU’s!