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Greenhouse Heater Calculator
If you need to purchase a greenhouse heater, this calculator will help you decide on the size needed for your greenhouse based on your climate, desired minimum greenhouse temperature, and the greenhouse covering used.
If you need a square-foot Surface area, please select this link for Greenhouse Surface Area Calculators.
| Material | U-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.