Heating a Hoophouse...What size/wattage heater?

[Roguejim]

Say the hoop house measures 5x5 s/f, height 3-4', what size/watt heater would it require if ambient nighttime temps dipped to 40F?

 

[organic pepper]

Say the hoop house measures 5x5 s/f, height 3-4', what size/watt heater would it require if ambient nighttime temps dipped to 40F?

You should be able to use the greenhouse heating calculator. There are quite a few different one's online. There are different variables in the equation. Just got to fill in the blanks. Hope that helped.