Catch the Sunshine!
You have no items in your shopping cart.
The most trusted name in greenhouses & supplies • Serving the horticulture industry since 1946!
Greenhouse Manufacturer, Distributor, Importer-Exporter
Greenhouse Heater Calculator
If you need to purchase a greenhouse heater, this calculator will help you decide on the size of heater needed for your greenhouse, based upon your climate, desired minimum greenhouse temperature, and the greenhouse covering used.
If you need Surface area in square feet, Please select this link for Greenhouse Surface Area Calculators
| Material | Loss Value (approx) |
|---|---|
| 4-mil polyethylene | 1.20 |
| 6-mil polyethylene | 1.15 |
| 6-mil polyethylene - double layer, inflated | 0.70 |
| Glass - Single Layer | 1.13 |
| Glass - Double Layer | 0.50 |
| Acrylic Double Wall | 0.54 |
| Fiberglass | 1.20 |
| Corrugated Polycarbonate | 1.00 |
| 4mm Twinwall | 0.70 |
| 6mm Twinwall | 0.63 |
| 8mm Twinwall | 0.60 |
| 10mm Twinwall | 0.56 |
| 10mm Triplewall | 0.54 |
| 16mm Triplewall | 0.40 |
| 16mm Five-wall | 0.33 |
| 25mm Triplewall | 0.28 |
| 25mm Five-wall | 0.25 |
Note: U-Factor (BTU/hr. - ft2 F) or (1/R-value) 1 divided by the U-value equals the R-value.