How to Select a Humidifier for Grow Tent or Grow Room

Did you know that keeping the humidity level in a grow room/tent at 40-50% can improve overall plant development? This is only one of the multiple benefits! However, choosing a humidifier for grow tent can be quite tricky as they all look pretty much the same, so let this concise guide by experts help you make a considered decision.

First of all, learn how to distinguish one type of humidifier from another:

  1. Ultrasonic – it’s one of the most popular solutions due to an option to produce both cool and warm mist and silent performance. The downsides include a higher price tag and the inability to work with tap water.
  2. Cool mist humidifier – it’s usually the cheapest option with the simplest maintenance, but you should remember that cool mist lowers the temperature inside the grow room or tent.
  3. Warm mist humidifier – this type heats the water and blows hot mist. It can destroy various harmful bacteria and organic compounds but also warms the air inside the room or tent.
  4. Evaporative humidifier – this type blows vapor instead of mist and filters the air stream. This raises maintenance costs as well, though.
  5. Air washer – this is the largest, the most advanced, and the priciest option, but it’s also the most advantageous for large grow rooms where coverage and air purification are more important than cost and maintenance frequency.

Features to Consider

Now that you can define one type from another, pay attention to the following details:

  • Grow room size – this is the most important aspect. Measure the room/ tent area size and look for a humidifier that promises to cover slightly more than that.
  • Cool vs. warm mist – learn about the required temperature regimes of your plants and consider the average temperature outside the room/tent. If it’s cold outside, then warm mist is needed and vice versa.
  • Water clarity – if the water you use contains too much mineral dust, look for evaporative humidifiers and air washers as they can purify the water.
  • Automatic or manual – ultrasonic humidifiers and air washers usually come with automated features, which makes them more autonomous. You can also save by avoiding these features if you don’t need any automation.
  • Filter replacement – some models require monthly filter replacement, while others can keep using a single filter for up to 6 months. Always consider the long-term costs of filter replacement for your particular model and look for alternatives to save up.
  • Cleaning – all humidifiers can suffer from mold, so it’s important to regularly clean them. While this is a rule for every model, you should avoid those items that involve complicated dismantling. You will simply get tired of the need to deal with an “innovative” design. Look for something simple to avoid frustration in the future.
  • Noise – consider buying a humidifier that is claimed to operate silently if the noise level matters to you and the people you live with. The best way to learn about the actual noise levels is to read user and expert reviews.
  • Portability – if you are looking for a large humidifier, you better get the one with wheels to move it around without breaking a sweat. As for the compact models, make sure the tank size-evaporation speed ratio is suitable for your needs.
  • Budget – count maintenance costs, choose the products with the best warranty and don’t get tricked by the brand names.

Humid & Thriving

A thoroughly selected humidifier is a fundamental lifecycle part for the vast majority of plants in grow rooms and tents. The good news is that they are not expensive at all and work surprisingly efficiently even if you get the simplest budget model. If everything is clear, share the humidifier you selected in the comments. If not, you’re welcome to ask. We will help you find the best solution!


Amelia Robinson is a lover of plants and gardens, as well as an educator on this topic. It’s her goal to make sure that you get the chance to learn what you need to about gardening to succeed with your own home garden at the blog You’re not going to find just a collection of basic articles about gardening here. Instead, she wants to answer the difficult questions for you. She tweets at @robinsonplants

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