To calculate heating needs, begin by determining the greenhouse’s total square footage and the desired temperature inside. Next, calculate the heat loss, which depends on factors like insulation, glazing material, and external climate conditions. You can estimate the heat loss using a simple formula, considering the difference between the inside and outside temperatures, as well as the insulation value (R-value) of your greenhouse structure.
For a more accurate estimate, take into account the greenhouse’s shape, ventilation, and how much sunlight it receives during the day. Once you have an estimate of the heat required to maintain the desired temperature, you can select a heating system that matches your needs, whether it’s electric, gas, or a more passive method like a thermal mass heater. It's important to overestimate heating needs slightly to account for sudden temperature drops and to ensure the system can handle extreme weather.
