It depends on your climate and what you want to grow. Many owners successfully grow cool-season crops with little or no heat thanks to Riga’s strong insulation. A heater is recommended if you want to maintain warmer temperatures or grow heat-loving plants through winter.

Smaller Riga models (such as the ‘S’ series) often work well with a 1,500W electric heater. Larger models, especially the XL, generally benefit from higher-output units (13,000–17,500 BTU range). Matching the heater to your greenhouse size and local winter temperatures is important.

Electric heaters are the most common and convenient choice for most Riga owners. They are clean, easy to control with a thermostat, and do not produce combustion fumes. Propane heaters can also be used but require proper ventilation.

Yes. A thermostat prevents overheating, reduces energy use, and helps maintain more stable temperatures for your plants.

It is possible, but greenhouse-rated or properly protected heaters are preferred. They are better suited to humid conditions and often provide safer, more consistent performance.

Yes. Riga greenhouses (especially models with thick twin-wall or triple-wall polycarbonate) retain heat efficiently, so a properly sized heater typically runs less often and costs less to operate than in thinner greenhouses.