Installing a Greenhouse Heater this winter will protect your crops from frost bite & inhospitable temperatures. This will ensure that you will reap the rewards for your green fingered hard work through the cold months. Experts in heating, we recommend either instant heat sources to boost temperature such as fan and ceramic heaters or low level constant heaters such as tubular. The choice will be down to personal preference plus the type of crops being yielded or in some case using both forms are an ideal solution. TIP: Use bubble wrap to insulate windows and doors.