Connect with us


How Much Warmer Is A Plastic Greenhouse Than Outside?

How Much Warmer Is A Plastic Greenhouse Than Outside

When preparing your greenhouse, think about what will make the temperature inside warmer than outside. Using a 55-gallon plastic container painted black and filled up about 3/4 full with water, for example, will make the greenhouse much warmer than outside, but you should also take into account the amount of heat lost during the night. Typically, a greenhouse will stay 20 to 30 degrees warmer than outdoor temperatures, thanks to the heat from the water.

Heat sinks

Plastic bottles make excellent heat sinks. These can be painted black and filled with water. They can be placed around the greenhouse to absorb heat from the sun and release it in the evening. This is a simple method that can have big benefits for your plants. Heat sinks can help keep your greenhouse cooler in summer and warmer in winter.

The first step is to dig a hole that’s three to four feet deep. After digging the hole, fill it with a material that can absorb and hold heat. Some good options include pea gravel, crushed glass, and small pieces of metal. Fire bricks are another great option.

Propane heaters

Propane heaters for plastic greenhouses are one of the most affordable and efficient greenhouse heating options. These units are easy to install and maintain. Propane heaters work by converting gas into heat. They take the least amount of time to warm up the greenhouse, and they require minimal maintenance. Propane heaters should have a thermostat to set the right temperature. They should also be energy efficient, which means converting the maximum amount of power into output while minimizing power loss.

Propane heaters are also available in portable models that are easily moved around the greenhouse. They are lightweight, making them a convenient option for people who move frequently. Lastly, make sure to choose a spot in the greenhouse that is level and clear of obstacles.


Candles can be a great way to heat your greenhouse without a costly and complex heating system. Candle heaters provide an even, uniform heat dispersion over a long time. They work best when the pot is at the top, where it can disperse the heat over many hours. However, it’s important to use caution when using candles in your greenhouse. They can be dangerous, and a carbon monoxide detector should be installed in the greenhouse.

Be sure to choose candles with a natural scent. Natural scents are typically derived from essential oils, which are derived from plants. Since essential oils can cause environmental harm, make sure to choose those without GMOs and other harmful ingredients. You can even choose to buy candles that use soy wicks, which are more sustainable than other waxes.

Germination mats

A germination mat is an excellent choice if you want to keep your greenhouse warmer than the outside temperature during winter. These mats can help you provide healthy rooting conditions for your plants, and they are much cheaper than heating your greenhouse. You can also install a heating unit with power lines, which can be extremely cost-effective.

Germination mats are also effective in encouraging early-season plant growth. The heat from a propane heater or electric space heater can be easily distributed throughout the greenhouse with a fan. Larger growers can also invest in a duct system near the roof to channel the heat to the interior.

Mylar sheets

Mylar sheets can help you achieve a more comfortable growing temperature. They allow light to pass through almost unobstructed, and they are UV resistant, meaning they won’t fade or crack over time. In fact, Mylar sheets can actually be reusable if they are properly installed and don’t suffer from damage.

Mylar is a thin sheet of plastic with a shiny metallic film. This layer acts like a blanket. In the wintertime, you can use one to line the inside of your car. The Mylar blanket will keep the warmth inside your car, preventing you from overheating. They also protect you from wet ground.