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Thread: Heaters & Swamp Coolers

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    Formerly known as Pineapple Nepenthesis's Avatar
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    Heaters & Swamp Coolers

    The time has come that I need to get my heater/swamp cooler for my greenhouse. It's a greenhouse for nepenthes and other tropical plants. I'm hoping to keep it 50F at night in winter and 70F during the day, if possible. When it's 70F outside and there are no clouds (it can get up to 100F in the summer), it can get up to 100F inside the greenhouse. Will a swamp cooler actually help cool the greenhouse down while maintaining humidity? It seems kinda like a long shot... It's a harbor freight 6x8 greenhouse, nothing fancy. I just want something cheap to get to a place where I can keep my nepenthes outside in the greenhouse.

    Does this work for a heater?

    1500-watt heater

    Anyone have suggestions as to which swamp cooler I should get? Preferably less than $150, but capable of cooling down my greenhouse quickly and efficiently. What do you guys use in your greenhouses?

    Oops, also forgot to ask... What thermostat do you guys use in your greenhouses? Looking for something that works well but is not pricey. Just need something that can turn my heater on when the temperature drops before 50F and turn the swamp cooler on when the temperature goes above 85F.

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    Admin- I'm growing CPs in the Desert of Tucson, Az. adnedarn's Avatar
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    Where are you? Your humidity levels outside will effect drastically a swamp cooler's effective cooling.
    -Andrew
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    Steve Booth's Avatar
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    Hi Pineapple

    The swamp cooler will not only cool but also increase humidity levels. As Adnedarn says the temp and humitity will affect the outputs. But iff you can tell us your typical temperature and humidity in the greenhouse I can work out what is possible, temp and hums, with an evaporative cooler.

    Cheers
    steve

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    Formerly known as Pineapple Nepenthesis's Avatar
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    It's usually around 50%-60% in the winter outside and on hot summer days it can get pretty low. At night it usually gets up around 90%. It's usually so humid that moisture gathers on the panels inside of the greenhouse.
    General temperature in the greenhouse is about 10F warmed than the outside air temperature on a sunny day, but when its in direct sun (for about an hour or two in the afternoon) it can get up to 100F with drastically low humidity.

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    richjam1986's Avatar
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    I assume you use shade cloth? That alone will work wonders. Also, Nepenthes can do wonderfully well in "less that optimal" humidity, so perhaps don't be TOO worried about the humidity, and don't be afraid to vent your greenhouse out in the summer (i.e. open the door or vents).

    That being said, allow your plants time to acclimate to lower humidity and new conditions.
    Da' mishu
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    My Growlist: http://www.terraforums.com/forums/sh...29#post1089429

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    Formerly known as Pineapple Nepenthesis's Avatar
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    I need to order some 50% shadecloth online along with the heater/swamp cooler. Good to know that will also cool of the greenhouse. Is it okay to put it on the inside of the greenhouse rather than the outside? That way it wouldn't blow off. :P

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    Admin- I'm growing CPs in the Desert of Tucson, Az. adnedarn's Avatar
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    Still didn't say your outside temp Here is a chart as related to outside temp. and humidity as to the temp. of the air will likely be.



    You need the cooler outside the greenhouse sucking fresh air, and blowing into the g/h and letting the hot air out somewhere (top is best where it's the hottest). then, it's time to start working with the microclimates this will create. Right next to the cooler, is cooler than at the other end of the g/h or outside of the direct air flow. This will increase humidity- but may still be low pending outside humidity... Doesn't sound like you get as dry as I am, but with single digit humidity outside, my greenhouses would sit around 20-30% without supplemental humidification.

    For a heater, I use an unvented propane heater in the big greenhouse to maintain temps around 55 in the winter. In the small greenhouse I use a 1500w oil filled heater. both have built in thermostats.
    For a cooler- I have used both "portable" coolers and full size house coolers retrofitted with a "masterstat" made by mastercool thermostat.
    Andrew
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    Formerly known as Pineapple Nepenthesis's Avatar
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    Quote Originally Posted by adnedarn View Post
    Still didn't say your outside temp Here is a chart as related to outside temp. and humidity as to the temp. of the air will likely be.



    You need the cooler outside the greenhouse sucking fresh air, and blowing into the g/h and letting the hot air out somewhere (top is best where it's the hottest). then, it's time to start working with the microclimates this will create. Right next to the cooler, is cooler than at the other end of the g/h or outside of the direct air flow. This will increase humidity- but may still be low pending outside humidity... Doesn't sound like you get as dry as I am, but with single digit humidity outside, my greenhouses would sit around 20-30% without supplemental humidification.

    For a heater, I use an unvented propane heater in the big greenhouse to maintain temps around 55 in the winter. In the small greenhouse I use a 1500w oil filled heater. both have built in thermostats.
    For a cooler- I have used both "portable" coolers and full size house coolers retrofitted with a "masterstat" made by mastercool thermostat.
    Andrew
    Thanks for the chart! That really helps. Looks like it should work out pretty well with my conditions.

    I can figure out a way to hook up a hose to the evaporative cooler to pull outside air into the greenhouse. That shouldn't be an issue.

    Do you have a specific brand or model of evaporative cooler that you prefer over others? Don't want to get one that will crap out on me or not do its job.

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