Greenhouse

Greenhouse size calculator

Greenhouse size calculator
  • 1654
  • Richard Franklin
  1. How do you calculate the size of a greenhouse?
  2. What size greenhouse film do I need?
  3. How do you calculate BTU for a greenhouse?
  4. How much heat does a greenhouse need?
  5. Does greenhouse plastic have to be clear?
  6. How do you measure a shade for a greenhouse cloth?
  7. How do you make a greenhouse hoop?
  8. How do you measure PVC for a hoop house?
  9. How many watts do I need for greenhouse?
  10. Is it expensive to heat a greenhouse?
  11. How much would it cost to build a greenhouse?

How do you calculate the size of a greenhouse?

Sizing a Greenhouse Heating System

  1. Calculate the total surface area. First measure the end wall: 35 ft width x 14 ft (average wall height) = 490 (one end) ...
  2. Multiply the square feet by the U-factor. ...
  3. Add the numbers. ...
  4. Multiply by Delta T (the amount of heat loss over the length of the house.) ...
  5. Calculate the amount of BTUH.

What size greenhouse film do I need?

Multiply measurements B and D to determine film size for each end wall. We recommend adding at least 1-foot to each measurement for attaching the cover to the greenhouse. Calculate film size for top and sides: A x (C + 2- to 4-feet) (We recommend adding 2' to 4' to the C dimension to ensure a proper fit.)

How do you calculate BTU for a greenhouse?

Determine the heat loss factor for the greenhouse covering material. Multiply the square feet by difference in temperatures, then by the heat loss factor. This is the minimum heater BTU rating to keep your greenhouse at the desired temperature during the coldest time of year.

How much heat does a greenhouse need?

With proper insulation, greenhouses can remain 30 degrees Fahrenheit warmer than the air outside. This means that you can have a productive greenhouse in the winter down to -17 degrees Fahrenheit before the air in your greenhouse reaches the frost zone.

Does greenhouse plastic have to be clear?

When you use colored plastic, this will impact the amount of sunlight in your greenhouse. It's better to use clear plastic and cover up with a shade cloth during summer, if necessary.

How do you measure a shade for a greenhouse cloth?

Ideally, the shade cloth should drape down the sides of the greenhouse from the roof. To make sure these will be equal measure the distance from the top of the roof to up to two thirds down of the both sides.

How do you make a greenhouse hoop?

Choose a location with deep, stone-free soil to make anchoring the structure much easier.

  1. Build Your Own Hoop House. ...
  2. Build a Ground Frame. ...
  3. Drive Ground Pipes. ...
  4. Raise the Hoop Pipes. ...
  5. Install the Purlins. ...
  6. Add and Anchor Plastic. ...
  7. Build End Walls. ...
  8. Hoop House Floor.

How do you measure PVC for a hoop house?

To determine the length of the pipes, double the width of the bed. For example, a hoop house placed over a 3' bed will need PVC pipes 6' long. To determine the number of PVC pipes, consider that for about every 3' to 4' of house length, a structural support for the plastic roof is needed.

How many watts do I need for greenhouse?

Most gardeners use at least 25 watts per square foot of garden space. However, this can vary depending on the amount of supplemental natural sunlight you receive, or if you are growing a plant that does not need much light like lettuce.

Is it expensive to heat a greenhouse?

Heating a greenhouse with gas is the least expensive option. The cost of heating a greenhouse with gas is the main advantage of gas heating and is the main reason people choose gas heating over other options. ... If the heater turns off during the night, all the plants in the greenhouse could perish.

How much would it cost to build a greenhouse?

The national average cost range to build a greenhouse is between $5,000 and $20,000, with most people paying around $10,000 for a backyard greenhouse measuring 10' x 40' with a gable roof.
...
Cost to Build a Greenhouse.

Greenhouse Building Prices
National average cost$10,000
Average range$5,000-$20,000
Minimum cost$1,000
Maximum cost$35,000

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