The winter greenhouse – to heat or not to heat? That is the question!!!
We all want to use our greenhouses in the winter. But, it can be costly to heat them all winter long. For certain crops you will need the heat. Do you want to grow seasonal winter crops without the cost of additional heating? Or, do you want to pay the heat bill to have tomatoes and peppers all winter long? That is the real question.
Did you know that a greenhouse will build up a lot of heat during the day? That is why you need a ventilation system in place. But, once the sun goes down the heat will begin to dissipate and disappear. In order to keep your greenhouse above the outside temperature at night you will need to have heating systems or other solar systems in place.
You can keep some heat in your greenhouse at night by using a few solar practices. You can pull a solar blanket over the roof of the greenhouse to help keep any heat inside. These are on the inside of your greenhouse and are typically a heavy blanket that can be pulled at night.
Probably the most popular and easiest method is to use black containers filled with water. These will build up heat during the day and let off the built up heat slowly through the night. You can use gallon water jugs painted black or 55 gallon drums.
You can put a compost pile in your greenhouse. Although, I have heard quite a few people complain about the smell. If you have a properly balanced and properly functioning compost pile you should not have these odors. But, if you want to spend some time and money you can put your compost pile outside and pipe water through the pile (which will heat the water in the pipes) and through the greenhouse for heat.
Some people will use a layer of bubble wrap (yep, like what is used for packing in all the boxes you receive) to help add insulation to their greenhouse. They basically just line the interior with the bubble wrap to help keep the greenhouse a little bit warmer.
These methods will all give you supplemental heat, but none of them will give you a way to control what end temperature you require. To set the heat at let’s say 60 degrees, you will need a heater with a thermostat.
Greenhouse heating systems are available in electric, natural gas and propane. I much prefer the natural gas or propane. My top pick, and the heater that I use in all of my personal greenhouses, is the Southern Burner heater. I have used both the natural gas and the propane models. I find that they both function the same. These are great heaters because they require no electricity. They are the perfect size to fit under a greenhouse bench, thus staying out of the way and not using up valuable space. There is a vented and a non vented model. I personally have always used the non vented heater, but there are some locations in the US where this is a problem and against code. Even though it is called a non vented heater you still need to have a fresh air supply.
Max/ Min Thermometers
A relatively inexpensive, but very valuable tool is a max/min thermometer. These can go from low tech models to models where you can monitor the temperatures from inside your home. Some even have an alarm system set up with them if the temperature drops too low. These are valuable in both a heated and unheated greenhouse to help you troubleshoot any potential problems that you may have.
Crops You Can Grow in a Heated Greenhouse
You can grow just about anything that you can grow in your garden in the summer if you heat the greenhouse. Your night time temperature for tomatoes must be a minimum of 55 degrees. You can also grow peppers, squash, cucumbers, melons, beans, eggplant, corn, basil, tomatillos, etc.
Rules To Growing in an Unheated Greenhouse
If you are growing in an unheated winter greenhouse there are a few rules you should follow for the best harvest. You must be growing crops that are in season during the winter in your area. These cool weather crops include crops such as lettuce, spinach, chard, carrots, etc. Do NOT try to grow warm weather crops in an unheated winter greenhouse. If you are not sure of your growing seasons I would check with my local extension office to see if they have a free vegetable planting guide available. If you don’t know where they are just do a search for extension office “my town”.
Do not try to grow in containers. They will lose any heat they have retained rapidly. You should grow in the ground or in raised beds.
Cut back on how much water you think the plants will need. Plants require a whole lot less water in the winter than they do in the summer. Only water when the ground is dry 1″ to 2″ below the surface.
Grow in “layers”. Add a cold frame or a mini hoop house inside the greenhouse. If you have electricity you can even add heat cables to the cold frames or under the mini hoop house. I always like to use heat cables in my personal cold frames. I find that it gives a higher yield earlier. Just be sure that you check these in the morning. Depending on your location and your weather your cold frame or mini hoop house made need to be opened during the day and closed at night.
Crops You Can Grow in an Unheated Greenhouse
You can typically grow lettuce, spinach, radishes, carrots, beets, turnips, kohlrabi, broccoli, cabbage, bok choi, chard, greens, mustard greens, kale, chives, chinese cabbage, english peas, and cilantro (may require a double layer growing system such as the cold frame).
To heat or not to heat? Well, that is really your decision and should be based on how much money you want to spend for winter heat and what crops you want to grow. Whichever way you go, fresh veggies year round can’t be beat! Enjoy!
Product Review – America’s Best Polycarbonate, Best Buy Lean to Greenhouses
Today we are going to do a product review of one of the greenhouse kits that we offer. The America’s Best Polycarbonate Greenhouse and the Best Buy Lean to Greenhouse are basically the same structure, just one is freestanding and the other attaches to your home or a building. These both offer what we feel is the best “bang for your buck” in a greenhouse Made in the USA. They offer quality materials and excellent pricing.
The frames are made of 6063-T3 aluminum with a powder coated finish. This high grade aluminum gives the frame strength and durability. The standard colors are white, brown or green, but fear not, we can custom match the color of your home, your favorite sports team, just your favorite color. The stated wind and snow loading are 70 MPH winds and 23 pounds per square foot snow load. All framing is assembled using stainless steel T bolt and stainless steel lock nuts. This frame also has a 10 year warranty against damage due to faulty materials.
The greenhouse is glazed with 6mm clear twinwall polycarbonate. The polycarbonate sheets have a 10 year warranty that they will not vary more than 6% in light transmission in 10 years. This is a fancy way of saying that this material will not yellow, get brittle or break. Actually, I have personally seen this same material in use past 15 years. I have heard reports back from people in the industry who have seen this material in good usable condition up to a period of 20 years. There is also a 10 year warranty against hail damage. Some people do not like the twinwall polycarbonate because of the view through it. The twinwall is like looking down the end of a cardboard box. It will have a clear sheet on the inside, a clear sheet on the outside, and a rib that runs through the center of the 2 sheets. In a cardboard box the rib is wavy. In a polycarbonate sheet the ribs runs straight between the 2 outer sheets. This is what will distort your view. You will see color, but not form like looking through a glass window. But fear not, there is an upgrade available to both of these greenhouses. We call these options the See Through Polycarbonate Greenhouse and the See Through Lean To Polycarbonate Greenhouse. These both come with the twinwall in the roof, for protection against hail and/or falling objects. The sidewalls have a clear view polycarbonate sheet that is exactly like looking out through a window. The best of both worlds.
America’s Best Polycarbonate
Best Buy Lean To Greenhouse
See Thru Polycarbonate Greenhouse
See Thru Lean To Greenhouse
Another great feature is that the ventilation package is included in the pricing of this greenhouse. It includes the thermostat, exhaust fan and intake shutter(s) in the freestanding models. The lean to greenhouses do not have the intake shutters. Your combination storm door will supply added ventilation and supply the air intake for the lean to models. This “free” feature definitely adds to the value of the greenhouse. These systems cost in excess of $500 typically. Also included in the upgraded model is a circulating fan. This is an often overlooked, much needed, option. These will aid in the health of your plants by keeping the air in your greenhouse moving and reducing the humidity in the plant canopy. They help to maintain an even temperature in the winter when the greenhouse is heated, helping to avoid hot or cool spots in corners. We offer the homeowner the choice of the optional roof vents. I personally prefer to have these, as I feel you get a lot of use out of them in the spring and fall seasons. They typically stay closed in winter and open in the summer, so the added benefit there would be natural ventilation in the summer months. The reason I like them in the “between” seasons is that you run the possibility of a cold night and a hot sunny day. You would want your vents open during the day and closed at night under these circumstances. That is why I always use automatic roof vent openers with my greenhouses.
The integral base is built into the greenhouse, so no need to build an additional base for the greenhouse. We do however recommend setting the greenhouse on a foundation of 4″ x 6″ timbers set down into the ground. We tie the timbers to the ground using rebar stakes. This will help keep your greenhouse secure in higher winds. Do you prefer to build a knee wall to place your greenhouse on? This is not a problem. We also offer an optional door drop to accommodate this. We just need to know the height of your kneewall in inches and we will adjust the frame while building it so that the door will fit to the ground.
This greenhouse is shipped by Common Carrier (truck line). It will come in 3 – 4 boxes depending on accessories and size of the greenhouse. Two people should be present to unload this greenhouse. These typically take about 4 weeks from the time they are ordered until the time you receive them. Your greenhouse is built specifically for you. There is no need to accept a “boxed” greenhouse with no options.
In closing, with all of the quality features, excellent pricing and the fact that this greenhouse is Made in the USA, we give it 2 (green) thumbs up.
Greenhouse Glazing Materials, Warranty vs Life Expectancy
I get asked a lot about how long certain greenhouse coverings will last. The thing is, the limit of the warranty does not equal the life expectancy of the material. I will address the following materials – 6 mil, 4 year polyfilm, reinforced polyfilm and polycarbonate sheets. I will be mentioning the UV protection. That is what keeps the materials from getting brittle, cracking, or turning yellow. The warranty will typically cover how long the manufacturer expects the UV protection to last, or it may refer to how much the UV protection may change in a certain period of time.
Greenhouse polyfilm is typically listed by the thickness and the length of the time that the UV protection is warranted for. 6 mil, 4 year polyfilm is 6 mil thick and has a UV protection that is warranted for 4 years. But, that does not necessarily mean that it will last the entire 4 years. The material will not get brittle, etc, but if it is damaged (due to a falling limb, hail, etc) there is a possibility that the cover will be lost. There is patching tape for the film coverings, but if you are not at the greenhouse when the damage occurs it may be too late to stop it. This will be the least expensive of the greenhouse glazing choices and is excellent for small hobby or commercial greenhouses. Although most of the commercial greenhouses will use a double layer of this film with a blower that blows air between the 2 layers. This will definitely increase the insulation factor for this material. I have had some growers report back to me that they feel the film is less likely to be damaged when using this double layer. They feel that the air between the layers “stretches” the film, making it tighter and less susceptible to damage from falling items.
The reinforced polyfilm is 2 layers of film laminated together with a rip stop feature in between the sheets. This has a one year warranty on the UV protection. But, we have had reports back from people who have gotten up to a 12 year lifetime from this material. The rip stop feature is what makes this possible. If the film does get a tear it cannot go any further than the cords of the rip stop. That will keep the area of the rip limited, and it is easily repairable once it is found.
Polycarbonate sheets are a rigid material. Many manufacturers offer a 10 year warranty that the light transmission will not vary more than 10%. The change in the light transmission is what causes the sheets to get brittle, yellow and crack. There are, however, some manufacturers out there now offering a comparable 20 year warranty. Please be sure to check with the company supplying you the sheets to see which warranty is offered. Polycarbonate is a tough material and typically has a 10 year warranty against hail damage. So, tearing or damage to the sheets is not near as big an issue as the polyfilm. In fact I have been dealing with polycarbonate sheets for over 20 years now and have never been involved in a warranty claim. I have had many people in the industry report back that they have seen polycarbonate sheets (with the 10 year warranty) last up to the 20 year mark. I personally have seen the 10 year warranty material remain usable at 15 years.
Hopefully this overview of the warranties and greenhouse glazing materials will give you the information you need to make the best decision for your greenhouse.
Are you building a homemade polyfim greenhouse, but are unsure about how to ventilate it? Here are a couple of solutions for you. You can see that this greenhouse has roll up sides, an option which is readily available, but can be costly. We have 2 options available that insert directly into your polyfilm covering without any additional framing. They use the channel base and wiggle wire to insert directly into the greenhouse covering. You simply cut the film and install these accessories directly into the film covering without any additional framing.
Intake Shutter with Solar Powered Opener
The first option is a solar powered greenhouse shutter. This has louvers and a wax cylinder powered opener. It will open when it is warm and close when it is cool automatically. They are available in 6 different sizes. If you would like to use this on another type of greenhouse such as polycarbonate, we can remove the base channel and you can insert this directly into a wood framed opening.
Solar Powered Roof Vent
The second way to do this is with a solar powered roof vent. This is a lightweight polycarbonate vent. It weighs less than 10 pounds, but you get all of the benefits of the durable polycarbonate covering. It also has the was cylinder powered opener that will automatically open and shut the vent as the temperature requires. To install this you simply cut the polyfilm and install it directly into the greenhouse covering.
A lot of people prefer to build their own greenhouses rather than purchase a kit. With these 2 ventilation options, there is no reason not to build your own polyfilm greenhouse.
Double Polyfilm Greenhouse
There are many benefits to polyfilm greenhouses. One thing is that some municipalities will consider this a temporary structure and will not require permits, wind and snow load ratings, etc. They are also less expensive than a rigid polycarbonate covered greenhouse. One disadvantage to this is that most of the greenhouse polyfilm found today has a 4 year UV protection, so you will have to figure on replacing the covering every so often. Double polyfilm greenhouses consist of 2 layers of polyfilm with an air inflation system for greenhouse film blowing air between the 2 layers. This will give you a much better R rating than just a single layer of film. Manufacturers claim that it can save you up to 40% of your energy costs. That is quite a considerable savings. I find that the inflated film is more rigid and less susceptible to damage than a single layer of film. This all happens without lowering the light transmission properties of the polyfilm. This is an excellent choice that has been used by many commercial growers through the years and is totally acceptable for a backyard greenhouse operation. Be sure to use greenhouse polyfilm that is UV protected and has an anti condensate coating on it. If the film is not UV protected you should not expect to get any more than one years use out of it, sometimes even less. The anti condensate coating keeps droplets from forming on the film. This will contribute to the overall health of your plants. Any condensation that does form on the roof will come off in sheets rather than in droplets. If you have water dripping on your plants you will have damage to your leaves, fruits, flowers and overall less healthy plants. So, when considering your first or next greenhouse, take a look at a double polyfilm greenhouse and see what benefits it will give you.