A greenhouse can become too hot for you and your plants very quickly without a properly sized ventilation system to provide adequate cooling. An exhaust fan system or automated roof vents can provide all of the needed ventilation / cooling during cooler seasons, but cooling in the summer can be much more difficult. A combination of shade, proper ventilation, and an evaporative cooling system like a misting system or evaporative cooler is recommended when outside temperatures begin to heat up.


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Watertight Fan System Wiring Kit fan, wiring, kit, wire, greenhouse, exhaust, conduit, electrical
Retail: $112.00
Price: $89.00
Availability: In stock

    These complete wiring kits are designed for wiring our variable speed fan systems in greenhouses or other wet areas. Kits use all rustproof materials which meet or exceed building code requirements for wet locations when properly installed, and the flexible conduit makes installation quick and easy. Wiring kit can be wired directly into an existing electrical line or wired to a power supply cord (included with our fan system packages) and plugged into an outlet. Fan Wiring Kit Includes...

    ACF Programmable Plug in Thermostat
    Retail: $59.95
    Price: $49.95
    Availability: In stock
    Item #: 4820530 -

      This thermostat is very accurate and can be used to control 110/120 volt heating or cooling appliances (15 amp max). To operate, simply plug it into an outlet, and plug your appliance into the front of the thermostat! This energy-saving thermostat has up to 4 different daily temperature settings during weekdays and another 4 on weekends. The thermostat can be set to automatically lower the night temperature and raise it in the morning and you will have 2 extra settings that can be set to...

      Exhaust Fan Replacement Motors motor, fan, exhaust, replacement, speed, hp, variable, 3, 2, JD, J&D, j, d, manufacturing, circulation, ez
      Price: $79.00
      Availability: In stock

        Replacement motors are for our variable speed and multi speed fans only. They are all 120v motors. Fan motors only come with what is shown in the picture. Motor Description Fits Circulation & Exhaust Fan Models 1/30 HP Multi Speed 12" Multi Speed Exhaust Fan 1/10 HP Multi Speed 16" & 20" Multi Speed Exhaust Fans 1/8 HP Multi Speed 24" Multi Speed Exhaust Fan 1/10 HP Variable Speed 12" & 16" Variable Speed Exhaust Fans12" & 20" Variable Speed Circulation Fans 1/3 HP Variable Speed 20" Variable...

        Greenhouse Intake Fan  greenhouse, intake, fan, roof, vent, blower, system, ventilation, duct, cool, cooling
        Price: $139.00
        Availability: In stock

          Provides fresh air for plants, helps control humidity, & boosts ventilation of roof vent systems!These intake fan systems are great for supplying fresh air to plants in the winter when it is too cold for traditional ventilation systems to run. Just set it on a timer to run a couple times daily for a few minutes. Bringing in fresh air also helps keep humidity from getting too high in the winter. The larger 8' intake fan is best for boosting the ventilation / cooling provided by greenhouses with...

          Grow More / Solar Harvest Automatic Vent Opener grow, more, greenhouse, kits, vent, opener, univent, automatic, solar, window, harvest
          Price: N/A
          (1)
          Availability: Discontinued
          Item #: 2532031 -

            UPDATEThese greenhouses now come with mounting brackets and do not require a separate one for installation. If you have an older model which did not come with brackets, please read the instructions for making your own below. This has been replaced by the Univent opener. Click here to view it. The Univent allows solar-powered control of top and side mounted window vents thanks to its dual springs. Univent window openers have an adjustable opening temperature of 60° F to 75° F and an 18" maximum...

            JDDT1 Adjustable Digital Thermostat (Wired) thermostat, water, proof, greenhouse, remote, sensor, j&d, temperature, control, digital, adjustable
            Retail: $110.00
            Price: $95.00
            Availability: In stock
            Item #: 4820075 -

              This thermostat is very accurate and can be used to control heating or cooling equipment. It has a NEMA 4X waterproof enclosure which was developed with harsh greenhouse environments in mind (it can even be used outdoors). The JDDT1 thermostat has a 10' waterproof temperature sensor which allows you to control temperatures remotely, and it retains settings in memory in case of power failure. The current temperature is shown on the digital display when thermostat is on. FeaturesHuge temperature...

              JDDT1 Adjustable Plug In Digital Thermostat  J&D, thermostat, digital, plug, in, portable, cord, jddt, greenhouse, waterproof, outdoor, remote, sensor
              Retail: $128.00
              Price: $109.00
              Availability: In stock
              Item #: 4820076 -

                This thermostat is very accurate and can be used to control heating or cooling equipment. It has a NEMA 4X waterproof enclosure which was developed with harsh greenhouse environments in mind (it can even be used outdoors). The JDDT1 thermostat has a 10' waterproof temperature sensor which allows you to control temperatures remotely, and it retains settings in memory in case of power failure. The current temperature is shown on the digital display when thermostat is on. Comes with 6' plug in...

                Portable Thermostatic Outlets
                Retail: $24.00
                Price: $19.95
                (2)
                Availability: In stock

                  Need an inexpensive and simple thermostat? Thermostatic outlets are the answer. These unique devices plug into a standard electrical outlet and have an internal preset thermostat. Outlets come in two models. The Cooling outlet supplies power at 78° and cuts off at 70° and works great for all types of fans including exhaust, circulation, window, attic, and ceiling fans. The Heating outlet supplies power at 35° and cuts off at 45° and is great for automating heaters to keep room temperatures...

                  SureStat TS110 Waterproof Heating / Cooling Thermostat
                  Sale!
                  Retail: $36.89
                  Price: $29.95
                  (4)
                  Availability: In stock
                  Item #: 4820930 -

                    SureSTAT TS110 thermostats have a watertight enclosure making them an excellent option for wet environments. The single stage thermostat can be used to automatically control ventilation fans or heaters. This thermostat was developed with the harsh greenhouse environment in mind. Temperature coil is stainless steel to prevent corrosion. SPDT switch. Wiring required. Features Wide temperature range: 30° to 110° F Fixed 3 degree temperature differential Can be used with millivolt, 12, 24 and 120...

                    SureStat TS116 Plug In Portable Thermostat Control thermostat, plug, in, portable, control, heater, fan, greenhouse, garage, shop, room, home, ac
                    Sale!
                    Retail: $58.95
                    Price: $44.95
                    (7)
                    Availability: In stock

                      This single stage thermostat comes prewired with an 6' grounded Plug-in power cord. Simply plug the thermostat into a standard 110/120 volt outlet. Then plug any 110/120 volt appliance into the outlet on the plug of the thermostat. Select heating thermostat to control a heater or cooling thermostat to control fans and/or louvers. *Plug-in thermostats can not be used with our gas heaters. They require 24 volt thermostats. FeaturesWide temperature range: 30° to 110° FFixed 3 degree...

                      SureStat TS200 2 Stage Thermostat Control thermostat, 2, two, stage, control, heating, cooling, water, proof, tight, weather, greenhouse, wet
                      Retail: $66.55
                      Price: $49.95
                      Availability: In stock
                      Item #: 4820910 -

                        This thermostat has a watertight enclosure making them an excellent option for wet environments. The two stage thermostat can be used to automatically open motorized louvers before cutting on an exhaust fan(s), stage multiple fan or heater systems, or operate multiple speed exhaust fans that do not already have a built-in control. Wiring required. Features Wide temperature range: 30° to 110° F Fixed 3 degree temperature differential between stages Can be used with millivolt, 12, 24 and 120...

                        24" Inflation Jumper Hose
                        Price: $16.95
                        Availability: In stock
                        Item #: 8030130 -

                          The jumper hose is used to allow inflation of side and end walls with one blower.

                          7 Day Programmable Timer timer, programmable, grow, light, plant, greenhouse, mist, misting
                          Price: $24.95
                          Availability: In stock
                          Item #: 5620105 -

                            This digital timer operates off of an internal clock and can be programmed with up to 8 different on & off settings per day. Each setting can be set to occur daily or during specific days of the week. Each on or off period is programmed in 1 minute increments. Timer features a heavy duty grounded outlet on the front and plugs into a standard 110/120 volt outlet (15 amp max). 7 Day Timer Instructions ...

                            Greenhouse Inflation Blower Fan inflation, fan, blower, greenhouse, CFM, plastic, inflate, poly, air, adjustable
                            Price: $64.95
                            Availability: In stock
                            Item #: 8030100 -

                              This blower is used for inflating two layers of polyethylene on a greenhouse. The air space between the two layers provides the greenhouse with insulation. Fan has an adjustable inlet for obtaining proper operating pressure. 4" diameter mounting flange. 50 CFM max output, 32 CFM at 0.4" SP

                              Heavy Duty 24 Hour Grounded Timer timer, 24, hour, light, plant, grow, auto, greenhouse, heavy, duty, 120, volt
                              Price: $15.95
                              Availability: In stock
                              Item #: 5620100 -

                                This 24 hour timer plugs directly into a wall outlet and can handle 1875 watts. You can set up to 48 cycles in 15 minute increments and set intervals from 15 minutes up to 24 hours making this timer excellent for lighting systems. No little pins to lose! Timer also features a manual override switch and LED light to indicate when power is on. 120 volt

                                Inflation Blower Mounting Bracket
                                Price: $18.95
                                Availability: In stock
                                Item #: 8030110 -

                                  These blowers are used for inflating two layers of polyethylene on a greenhouse. The air space between the two layers provides the greenhouse with insulation. Fan has an adjustable inlet for obtaining proper operating pressure. 4" diameter mounting flange. 50 CFM max output, 32 CFM at 0.4" SP Inflation Fan Mounting Bracket Instructions ...

                                  SureStat T110 Weatherproof Heating / Cooling Thermostat thermostat, water, proof, greenhouse, remote, sensor, surestat, temperature, control
                                  Price: $39.95
                                  (3)
                                  Availability: In stock
                                  Item #: 4820400 -

                                    This thermostat has a weatherproof enclosure making them an excellent option for wet environments. The single stage thermostat can be used to automatically control ventilation fans or heaters. This thermostat was developed with the harsh greenhouse environment in mind. Temperature coil is stainless steel to prevent corrosion. SPDT switch. Wiring required. Features Wide temperature range: 30° to 110° F Fixed 3 degree temperature differential Can be used with millivolt, 12, 24 and 120 volt...

                                    SureStat T118P Plug In Portable Thermostat Control thermostat, plug, in, prewired, cord, line, voltage, heater, fan, cooling, control, portable, 110, 120
                                    Price: $55.95
                                    (4)
                                    Availability: In stock
                                    Item #: 4820410 -

                                      This single stage thermostat comes prewired with an 8' grounded Plug in power cord. Simply plug the thermostat into a standard 110/120 volt outlet. Then plug any 110/120 volt appliance into the outlet on the plug of the thermostat. Select heating thermostat to control a heater or cooling thermostat to control fans and/or louvers. *Plug-in thermostats can not be used with our gas heaters. They require 24 volt thermostats. Features Wide temperature range: 30° to 110° F Fixed 3 degree...

                                      Bayliss MK7 Replacement Power Tube bayliss, mk7, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part
                                      Price: $26.95
                                      (5)
                                      Availability: In stock

                                        Bayliss power tube life is not infinite. Over the years, the piston moving through the seals gradually wears the seal material away, allowing a gradual seepage of wax out of the tube. This in turn reduces the pressure within the tube and eventually the opening distance achieved will be affected. This is when you need to replace the power tube cylinder.Bayliss MK7 power tubes are available with 2 different models. The only difference is the operational temperatures of the power tube. The Orchid...

                                        Evaporative Cooler Replacement Pads
                                        Price: $39.00
                                        Availability: In stock

                                          Replacement Aspen pads for evaporative air coolers. Just select the model cooler you have. You will receive a set of 3 pads which includes 2 for the side panels and 1 for the rear panel.

                                          Gigavent Replacement Power Tube gigavent, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part
                                          Price: $69.95
                                          Availability: In stock
                                          Item #: 8040155 -

                                            This cylinder tube powers the Gigavent automatic openers with no need for electricity. It contains a mineral wax which expands with heat. This pushes a piston which opens the auto vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong spring closes the vent and resets the piston. Made in Denmark.While this cylinder for the Gigavent automatic vent opener lasts a long time, eventually the piston rod moving through the seals will wear the seal material away, allowing...

                                            Intake Fan Adjustable Elbow
                                            Price: $8.95
                                            Availability: In stock

                                              Intake Fan AccessoryThe adjustable elbow allows you to direct the air flow from the intake fan in any direction up to 90 degrees.Options4" elbow is for use with the 4" intake fan system8" elbow is for use with the 8" intake fan system

                                              Intake Fan Wall Vent + Damper
                                              Price: $28.90
                                              Availability: In stock

                                                Intake Fan AccessoryThis is an optional exhaust outlet for the intake fan in areas that are tightly sealed. The outlet is screened and sealed with an automatic gravity damper.Options4" wall vent is for use with the 4" intake fan system8" wall vent is for use with the 8" intake fan system

                                                Intake Fan Wye + Screened Cap
                                                Price: $28.90
                                                Availability: In stock

                                                  Intake Fan AccessoryThe Wye connector splits the air flow from the intake fan into two directions for better air dispersion. An extra screened cap is included so both ends of the wye are protected.Options4" Wye is for use with the 4" intake fan system8" Wye is for use with the 8" intake fan system

                                                  Univent / Ventomax Replacement Power Tube univent, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part, ventomax
                                                  Price: $19.95
                                                  (1)
                                                  Availability: In stock
                                                  Item #: 8040130 -

                                                    This cylinder tube powers the Univent and Ventomax automatic openers with no need for electricity. It contains a mineral wax which expands with heat. This pushes a piston which opens the auto vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong spring closes the vent and resets the piston. Made in Denmark. While this automatic vent opener cylinder lasts a long time, eventually the piston rod moving through the seals will wear the seal material away, allowing a...