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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SureStat TS200 2 Stage Thermostat Control thermostat, 2, two, stage, control, heating, cooling, water, proof, tight, weather, greenhouse, wet
Retail: $68.95
Price: $49.95
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(1)
Availability: In Stock - Usually ships in 1 to 2 days.
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. SureStat Thermostat Features Wide temperature range: 30° to 110° F Fixed 3 degree temperature differential between stages Can be used with...

    Univent Automatic Vent Opener vent, opener, univent, automatic, solar, window, greenhouse, roof, auto, cold, frame, wax, ventomax
    Price: $39.95
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    (22)
    Availability: In Stock - Usually ships in 1 to 2 days.
    Item #: 8040120 -

      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 opening which would be reached at approximately 20° to 30°F above opening temperature. Univent openers are made from corrosion resistant materials including aluminum and stainless steel. Univents also feature a unique quick disconnect feature on the bottom of the unit which is useful when...

       Exhaust / Intake Shutters shutter, louver, fan, intake, exhaust, vent, greenhouse, garage, shop, louvered, ventilation, inlet, outlet, 8015205, 8015210, 8015220, 8015230, 8015240
      Price: $50 - $115
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      (9)
      Availability: In Stock - Usually ships in 1 to 2 days.
      Item #: 8015 -

        Need help sizing intakes for an exhaust fan? Use our Intake Shutter Size Guide These aluminum shutters are commonly paired with exhaust fans to allow make up air into the structure to replace the air being exhaust. They can also be used for exhausting air when paired with and evaporative cooler or intake fan. The frame is mill finish aluminum. The blades have a white enamel finish and a galvanized reinforcement strip across the top of each blade for added strength and counter balancing...

        Belimo Shutter Motors shutter, louver, motor, dayton, belimo, automatic, actuator, vent, greenhouse, 8015120, 8015121, 8015122
        Price: $149 - $159
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        (14)
        Availability: In Stock - Usually ships in 1 to 2 days.
        Item #: 801512 -

          Shutters can be equipped with one of these motors to automate them and prevent wind from opening the louvers when ventilation is not necessary. Belimo motors are assembled in the USA and well known for their superior quality and dependability. Use with any of our 110/120 volt greenhouse thermostats to automate them. Choose from wired for hard wired installations or plug-in which includes a 3' power cord with plug. Shutter Motor Features:Motors mount directly to shutter for easy...

          Fan & Shutter Weather Hood  weather, hood, fan, greenhouse, shutter, louver, galvanized, steel, cover, protection, wind, severe, snow
          Price: $69 - $119
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          (4)
          Availability: In Stock - Usually ships in 1 to 2 days.

            Weather hoods can be used with exhaust fans as well as intake shutters. They protect equipment from against harsh weather and severe wind. Weather hoods are shipped unassembled with easy step-by-step instructions to save you money on shipping costs. G90 galvanized steel construction. Description Dimensions A B C 12" Weather Hood (fits 12" fans & shutters) 13 3/4" 13 7/8" 11 1/2" 16" Weather Hood (fits 16" fans & shutters) 18 7/8" 20" 15 1/2" 20" Weather Hood (fits 20" fans & shutters) 22 3/4"...

            Gigavent Auto Vent Opener vent, window, opener, roof, automatic, solar, auto, greenhouse, cold, frame, gigavent, wax
            Price: $125.00
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            (4)
            Availability: In Stock - Usually ships in 1 to 2 days.
            Item #: 8040150 -

              This is the strongest vent opener we offer. It has a hydraulic cylinder which provides superior protection in windy areas. Opening temperature can be adjusted from 63° F to 77° F and maximum opening of 18" is reached at approximately 20° F above opening temperature. Gigavent cylinder can be installed in many different positions for maximum mounting flexibility. This model is too large for use with all of our greenhouses except some of the Cross Country models. Features Adjustable temperature...

              Grow More Univent Automatic Vent Opener grow, more, greenhouse, kits, vent, opener, univent, automatic, solar, window, harvest
              Price: $41.95
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              (4)
              Availability: In Stock - Usually ships in 1 to 2 days.
              Item #: 2532031 -

                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 63° F to 77° F and an 18" maximum opening which would be reached at approximately 20° to 30°F above opening temperature. Univents are made from corrosion resistant materials including aluminum and stainless steel. This model is recommended for use with older Grow More and Solar Harvest roof vents that did not include a...

                SureStat T110 Weatherproof Heating / Cooling Thermostat thermostat, water, proof, greenhouse, remote, sensor, surestat, temperature, control
                Price: $44.95
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                (9)
                Availability: In Stock - Usually ships in 1 to 2 days.
                Item #: 4820400 -

                  UPDATEThis has been replaced by the Surestat TS110 thermostat. Click here to view the updated version.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. SureStat Thermostat Features Wide...

                  SureStat T118P Plug In Portable Heating Thermostat thermostat, plug, in, prewired, cord, line, voltage, heater, fan, cooling, control, portable, 110, 120
                  Price: $55.95
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                  (5)
                  Availability: In Stock - Usually ships in 1 to 2 days.
                  Item #: 4820410 -

                    UPDATEThis has been replaced by the Surestat TS116 thermostat. Click here to view the updated version.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. Heating thermostat is great for automating portable electric heaters. SureStat Thermostat Features Wide temperature range: 30° to 110° F Fixed 3 degree differential...

                    3 Speed HAF Circulation Fans fan, circulation, greenhouse, haf, wall, mount, swivel, speed, garage, shop, air, flow
                    Price: $129 - $169
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                    (9)
                    Availability: In Stock - Usually ships in 1 to 2 days.
                    Item #: 802044 -

                      These multi speed circulation fans are composed of a high grade steel construction material with factory balanced aluminum blades all with a white powder coated finish for maximum corrosion and rust resistance. It is approved for use with misting and fogging rings for indoor and outdoor use. Fans have three speeds, completely sealed and permanently lubricated ball bearing motors with thermal overload protection and pull chain. The adjustable wall / ceiling mount bracket pivots up to 140°....

                      Bayliss MK7 Replacement Power Tube bayliss, mk7, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part, bayless, baylis, bayles
                      Price: $27 - $30
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                      (24)
                      Availability: In Stock - Usually ships in 1 to 2 days.
                      Item #: 804011 -

                        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...

                        Gigavent Replacement Power Tube gigavent, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part
                        Price: $69.95
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                        (1)
                        Availability: In Stock - Usually ships in 1 to 2 days.
                        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...

                          Univent Replacement Power Tube univent, power, tube, cylinder, replacement, spare, piston, vent, opener, rod, part, ventomax
                          Price: $19.95
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                          (8)
                          Availability: In Stock - Usually ships in 1 to 2 days.
                          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...

                            Variable Speed HAF Circulation Fans fan, circulation, haf, cooling, greenhouse, variable, speed, shop, ventilation, wall, mount, pole, 8020410, 8020430
                            Price: $169 - $195
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                            (1)
                            Availability: In Stock - Usually ships in 1 to 2 days.
                            Item #: 80204 -

                              These commercial quality circulation fans provide airflow for healthy plant growth and even heat and fresh air distribution in your greenhouse. All fans are variable speed capable when used with one of our fan speed controls and can be easily automated with a plug in thermostat. These fans greatly increase ventilation in greenhouses using roof vent systems and are effective at eliminating cold spots when heating your greenhouse. Requires standard 110/120 volt outlet.12" fan produces up to 1030...

                              Exhaust Fan Replacement Motors motor, fan, exhaust, replacement, speed, hp, variable, 3, 2, JD, J&D, j, d, manufacturing, circulation, ez
                              Price: $109 - $239
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                              (2)
                              Availability: In Stock - Usually ships in 1 to 2 days.
                              Item #: 8010 -

                                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...

                                Univent Opener Replacement Frame vent, opener, univent, automatic, solar, window, greenhouse, roof, auto, cold, frame, wax, ventomax, part, replacement
                                Price: $19.95
                                Availability: In Stock - Usually ships in 1 to 2 days.
                                Item #: 8040135 -

                                  This item is the Univent frame only. It does not include mounting hardware or a powertube (just the item pictured). Order this item only if you need to replace a broken opener or part of an existing Univent opener.

                                  Watertight Fan System Wiring Kit fan, wiring, kit, wire, greenhouse, exhaust, conduit, electrical
                                  Price: $89 - $209
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                                  (2)
                                  Availability: In Stock - Usually ships in 1 to 2 days.
                                  Item #: 49009 -

                                    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...

                                    24" Inflation Jumper Hose
                                    Price: $19.95
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                                    (2)
                                    Availability: In Stock - Usually ships in 1 to 2 days.
                                    Item #: 8030130 -

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

                                      AC Infinity 10 Extension Cords ac, infinity, AC-EXR9, outlet, AC-EXQ9, greenhouse, plug, plug-in, control, uis, replacement, smart, extension, cord
                                      Price: $8.99
                                      Availability: In Stock - Usually ships in 1 to 2 days.
                                      Item #: 482135 -

                                        These 10' cords are for use with the AC Infinity Control Outlets and 69 Pro controller. Use the male to male replacement cord to connect the Pro 69 controller to other devices. Note the AC Infinity control outlets each include one of these cords already. Use the male to female extension cord if you need to locate a control outle more than 10' away from the Pro 69 controller. Just connect this to the device's male to male connector. Up to 5 of these extension cords can be added together. ...

                                        Bayliss MK7 Replacement Spacer Set bayliss, mk7, power, part, replacement, spare, spacer, set, vent, opener, rod, temperature, knurled, adjuster
                                        Price: $9.95
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                                        (2)
                                        Availability: In Stock - Usually ships in 1 to 2 days.
                                        Item #: 8040117 -

                                          Replacement Spacer Kit for the Bayliss MK7 automatic vent openers. Bayliss Spacer Set Includes 2 x long connector rod 1 x short connector rod 1 x long spacer 2 x short spacer 8 x plastic washer 4 x retainer

                                          Bayliss MK7 Spare Adjustment Knob bayliss, mk7, power, part, replacement, spare, knob, adjustment, vent, opener, rod, temperature, knurled, adjuster
                                          Price: $6.95
                                          Availability: In Stock - Usually ships in 1 to 2 days.
                                          Item #: 8040116 -

                                            The Bayliss MK7 adjustment knob, aslo referred to as the knurled adjuster, is used to adjust the opening and closing temperature of the Bayliss opener. Screwing it all the way off disables the vent opener.

                                            Greenhouse Inflation Blower Fan inflation, fan, blower, greenhouse, CFM, plastic, inflate, poly, air, adjustable
                                            Price: $69.00
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                                            (5)
                                            Availability: In Stock - Usually ships in 1 to 2 days.
                                            Item #: 8030101 -

                                              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 and can be used to inflate the plastic on greenhouses up to 30' x 100'. 4" diameter mounting flange. Requires 110/120 volt electricity. Blower comes with a 5' power cord and includes a 1/60HP sealed ball bearing motor with thermal protection. The power usage is 0.25 amps...

                                              Inflation Blower Mounting Bracket
                                              Price: $19.95
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                                              (3)
                                              Availability: In Stock - Usually ships in 1 to 2 days.
                                              Item #: 8030110 -

                                                This bracket allows mounting of an inflation blower to the greenhouse frame and provides separation of the 2 layers of poly film on the greenhouse so that air can be pumped in between them. The air space between the two layers provides the greenhouse with insulation reducing heating costs. Inflation blower not included Inflation Fan Mounting Bracket Instructions ...

                                                Cooler Rigid Media Replacement Pads (3 pack)
                                                Price: $45 - $59
                                                Availability: In Stock - Usually ships in 1 to 2 days.
                                                Item #: 80172 -

                                                  Replacement rigid media pads for the 3500VK and 5800VK evaporative air coolers. These pads are constructed with a heavier, virgin quality kraft paper containing resin and anti-rot agents which provide effective and efficient cooling while giving our cooler pads greater durability, strength and longevity. 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. Evaporative Cooler Pad Dimensions3500VK model - 18" x 18"...

                                                  Evaporative Cooler Replacement Pads
                                                  Price: $39 - $79
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                                                  (2)
                                                  Availability: In Stock - Usually ships in 1 to 2 days.
                                                  Item #: 8016 -

                                                    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.

                                                    Thermostat Piggyback Cord
                                                    Price: $15.95
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                                                    (1)
                                                    Availability: In Stock - Usually ships in 1 to 2 days.
                                                    Item #: 48201 -

                                                      These cords can be wired to the Surestat T110 or the TS110 thermostats to convert them into plug-in thermostats. They can also be used as replacement plug-in cords for the Surestat thermostats that come with a piggyback plug-in cord installed. Item # 4820188, 4820190, 4820191 Piggyback Cord Wiring for Surestat Thermostats ...