How to Make a Home or Greenhouse Humidifier. Easy DIY!

Making a fully automated humidifier for the home, greenhouse, or grow room is super easy! You will only need the following items:
  • Any size House of Hydro Mist Maker kit. We Stock 1 through 12 Disc Foggers!
  • Waterproof Fan Kit   (120mm is the best option anything over 2'x4'x6' H)
  • Humidistat  (Optional)  
  • Mist Output Controller  (Optional)  
  • UV Sterilizing Light  (Optional)  
  • Auto Fill Float to fill your reservoir  (Optional)
  • 4" or 5" Fan/Duct Adapter Optional)
  • Jig Saw, Razor Knife or 4.75" hole saw for the 120mm, and 3" Hole saw for the 80mm Fan
  • Philips Head Screwdriver and four 2" outdoor wood screws, or 6-32x2" machined bolts with nuts 
  • Silicone Caulk (Optional)  
  • Saran Wrap or cooking spray (Optional)
  • Small GFI Power strip
  • Appropriately sized water Reservoir. Use a 27 Gallon Tuff Tote for 6 Disc Units and larger. No less than a 5 Gallon Bucket for 1 to 5 Disc Units. The water level must be kept as full as possible to avoid overheating. 
How to build your basic or fully automated DIY humidifier: 
  1. Place the silver transducer into the black float. 
  2. Assemble The fogger by plugging the silver transducer into the black transformer and tightening down the locking ring if there is one available. Your fogger is now ready to create mist. Just drop it in water to activate! 
  3. Next, we will mark and cut 2 or 3 similar holes in the lid of the water reservoir. Two are for output, and one is for your waterproof fan input. If you choose to have one output hole, it needs to be larger than the fan if you want to run the fan at full speed.
  4. The hole for the fan will be marked using the fan opening as a template. We then cut one or two holes for the output side. These holes need to be about twice the size (In Total) of the fan hole to prevent any back pressure on the fan. It's not the end of the world though. If you do have backpressure, you can turn down the fan speed. 
  5. To easily add a round duct to your fan, or your output holes, you can purchase our 120mm adapter piece.
  6. Using the screwdriver and deck screws or stainless nut's and bolts, mount your fan in place. 
  7.  (Gaskets are Optional) After cutting the holes you can make gaskets for your lid to prevent fog from escaping. Fan Gasket: lay a fat bead of silicon on your lid around the hole for your fan. Then place Saran Wrap over the silicon to prevent the fan from sticking permanently. Press the fan gently into its final mounting position, and let the silicon dry. Once dry, remove the fan and Saran Wrap leaving a formed gasket on your lid. Lid Gasket: turn the lid over and lay a VERY GENEROUS bead of silicon around the lid where it snaps onto the container. Lay Saran Wrap over the silicon to prevent permanent adhesion (or use cooking spray) and put the lid back on the container. Let the silicon dry and remove the Saran Wrap leaving behind a gasket. Depending on the type of tub, this is not necessary unless you are in an area where a few drops of water on the floor are an issue. 
  8. Cut a small notch in the water reservoirs edge to allow room for the cord to pass through. You can also use a grommet to run the cord if you want a clean finished look. 
  9. To easily add a 5" duct to your intake, or exit side, you can use this
  10. Drop the mist maker into the water, and place the lid on top. You now have a basic humidifier that will run 100% when plugged in (Note: 8 hours on, 1 hour off is the max run time) 
  11. You can manage the output with either a Humidistat (fully automated controller), Mist Output Controller, or a basic Timer from walmart. 
  12. To make a fully automated humidifier, read on...
  13. The next step is to add your Autofill Mini Float to the reservoir. This will allow for an external water feed to keep your water reservoir full. To do this, you will drill a hole just a hair larger than the floats threads, at least 3/4 of the way up the wall of your water reservoir. Check the cap for water flow direction and mount the float. Using a 1/2" water supply line, you can then hook up to an external source. NOTE: If in an area that you can not afford a spillover, it is recommended you put an overflow drain on the water reservoir in case of a valve failure. These are extremely rare but can happen if you have very hard water that can build up on the valve's internals. 
  14. Now you're ready to set up all the products together. Plug the humidistat into a GFI Outlet (like you have in your bathrooms) Anytime you have water and electricity, you should use GFI when available. 
  15. To run your fan and mist maker together, plug them both into a small GFI power strip, and then plug the strip into the humidistat. This way they operate simultaneously when the humidity drops too low. 
  16. Now you set the mist maker into the container, and place the lid on top. Set your humidistats parameters, and you're ready to go!
  17. Mount the Humidistat sensor in a central area, and make sure to J Hook the sensor so any water build-up does not fun onto the sensor, but will drip off the cord instead.  

If you have any questions at all about how to build your own humidifier using Mist makers, please feel free to contact us at We're always more than happy to help! 

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