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Choose the right temperature – 45✯ to 55✯ is adequate to keep young plants growing.Use a thermostat on any heater so you only heat when necessary.Insulate with horticultural bubble wrap.Sue Sanderson of Thompson-Morgan has additional suggestions. Wood stove will give off the most heat for little cost, but you must have wood available.Solar panels can be set up to create the electricity needed to run a heater.They require water circulation underground to transfer heating and cooling. Geothermal heating elements are probably the most complicated.Propane space heaters give off CO and needs to have an outside vent you can boil large pots of water and leave them in the greenhouse overnight.Ceramic space heater tile uses less electricity and is safe to touch may still need a fan to spread heat around greenhouse.

Get one with a thermostat so you can control heating temperature.

Electric space heaters can also be used, but need to be away from wetness.

Heat lamps can be used but you will want to add a fan to circulate the air to keep them from over heating and the closest plants from parching.

Terra cotta (AKA Clay) pots stacked with tea lights will add warmth.

Don’t plant directly in the composting material unless there is 6-8” of soil on top of the working mixture. Some greenhouse gardeners in other countries keep animals and plants together in their houses, you just need to watch where you step. While the composting process is taking place, heat is released.

Make a composting area using manure and kitchen scraps mixed with leaves and shredded paper.If you have a large greenhouse, black 55 gallon drums placed along the north side work well.

You can minimize the gunk (algae and water mold) by adding bleach. Dark bottles hold heat longer and don’t allow gunk to grow in them.

Use plastic bottles filled with water left sitting in the sun.

One big tip is to not plant right up next to the wall. The folks at Living the Good Life shared a video discussing 10 ways to heat your greenhouse.