Tag Archives: greenhouse heating

Calculating How Much Heat Is Needed for Your Greenhouse

greenhouse heater calculator Gothic Arch GreenhouseProperly heating your greenhouse is important as the warmer weather of autumn gives way to the cooler climate of winter.

But if your goal is to heat it efficiently, you’ll want to take these steps to more accurately determine how many BTUs are required to maintain the temperature you want.

To make your calculations, you’ll want to begin with precise measurements. Measuring tape, a calculator, and pencil and paper are requirements to gather this information. But depending the size of your greenhouse, you may also need a ladder or some additional help.

Record the following measurements to help you determine the total square feet of your greenhouse’s surface area:

  • Measurement 1: Height of the greenhouse sidewall from the ground to the lowest roof point.
  • Measurement 2: Length of the longest greenhouse wall.
  • Measurement 3: Length of the shortest greenhouse wall.
  • Measurement 4: Height from the ground to the highest point of the greenhouse roof.
  • Measurement 5: Length from the highest to lowest roof point along one eave.

To calculate the total surface area, add measurement 1 and 5 and multiply the total times 2, then add the number from measurement 2. Then add measurement 1 and 4, and multiply times measurement 3. Add these two numbers together, and you have the total surface area in square feet.

Next, record the desired temperature in Fahrenheit that you wish to maintain in your greenhouse. Subtract the coldest temperature your greenhouse experiences from this number—or add the two if it is a negative reading.

Make note of the heat loss value of your greenhouse covering. With these three calculations, you can determine the number of BTUs required to heat your greenhouse by multiplying the square feet by the temperature difference by the heat loss value. Or you can apply your measurements to our online greenhouse BTU calculator.

When shopping for a greenhouse heater, keep this number in mind. Purchase a unit that meets this minimum BTU output, but not much higher than what your calculations have suggested.

If you need assistance determining your heating needs for your greenhouse, please call one of our friendly representatives at 800-531-4769 or visit our website at www.GothicArchGreenhouse.com. We’ll be happy to help you get your greenhouse prepped for winter!


Efficiently Heating Your Winter Greenhouse

https://www.gothicarchgreenhouses.com/heating.htmCooler temperatures are coming, and with them the challenge of adequately heating your greenhouse if you’re planning to use it to extend your growing season.

Creating a stable environment in which your plants can thrive is always going to be the key to your gardening successwhether it’s supplying enough ventilation in the summer or enough heat in the winter.

To prepare your greenhouse for the frosty weather ahead, you’ll want to especially focus on the following three tasks.

  • Insulating your greenhouse may be the best first step to efficiently heat it for the upcoming winter months. Lining the inside of a greenhouse with bubble wrap is often recommended to help seal in the warmth without turning on a heater! Be sure to purchase bubble wrap from your greenhouse supplier, as it will be more durable because it is toughened and UV stabilized. Other options to consider are insulating the perimeter of your greenhouse with foam (said to provide one of the shortest returns on investment). Even adding insulation below the benches in your greenhouse can offer substantial savings.
  • Monitor your greenhouse with the help of a thermometer and a thermostat. Your thermometer will give you maximum and minimum daily readings that will allow you to use a greenhouse heater more efficiently, making any necessary adjustments that will help keep your plants happy and make your utility bill more manageable. Likewise, you can program a thermostat so that the heat kicks on when the temperatures drop below a certain point. It’s also important to know what conditions your plants need so you don’t waste money or energy maintaining higher temperatures than needed.
  • Invest in a heating system for your greenhouse. Greenhouse heaters are available to provide any necessary additional heat. But don’t overlook the importance of circulation. Fan heaters are a nice option to facilitate the flow of air, preventing any cold spots and reducing the risk of disease. Depending on how much heat you need, you may be able to use natural sources to provide warmth for your plants. For example, water in large drums or containers painted black (for maximum solar gain) placed strategically around your greenhouse will absorb energy during daylight hours and slowly emit it when the temperatures start dropping.

Wondering what else you can do to prep your greenhouse for winter? Call us at 1-800-531-4769 to speak with one of our friendly representatives or visit our website, www.GothicArchGreenhouses.com to learn more.