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FAQs

Here is a collection of some common questions that we have been asked ver the years.

What do HydroMist products do?
HydroMist™ products create, through high pressure, a very fine water misting vapor (or fog). As the fan blows air, the vapor completely flash evaporates. This action requires energy, which is obtained by drawing heat out of the air. The result is dramatically cooled air, reducing temperatures in the immediate area by up to 25° F (14° C), even in direct sunlight. Complete evaporation assures no wetting of people or environment. HydroMist™ products simply attach to a fresh source of water, like a spigot with a garden hose or indoor faucet.
Most cooling systems use a 'misting' system which doesn’t use our innovative high-pressure impeller nozzles, resulting in larger water droplets, which don't evaporate. These basically end up spraying water onto everyone and everything.
Other cooling systems make use of a trickling 'waterfall' behind a fan (also known as "swamp cooler.") The water is constantly recycled, while open to the environment. These systems get dust, dirt, pollen, etc. into the water sponge, which in turn gets recycled and blown onto participants. Also, forgetting to change the water leads to very nasty, moldy, smelly, conditions… thus the term “Swamp Coolers”.
Lifehacker.com has a short article about the concept of flash evaporation and how little water it can consume.* The article discusses the concept of creating your own flash evaporation system. HydroMist™ does not recommend creating completely DIY (from scratch) high-pressure misting systems, as improper use of high-pressure pumps (without appropriate safety sensors, switches, etc.) can cause damage to equipment and/or personal injury. HydroMist™ pumps are equipped with cut-off switches to prevent motor burn-out, in the case of insufficient inlet water pressure or flow. DIYers can have piece of mind with HydroMist™ flash evaporation components, knowing that they will assemble a quality high-pressure misting system.
*HydroMist™ does not endorse any articles at lifehacker.com. HydroMist™ does not monitor or moderate content located at external web sites; view at your own risk.
How much water do HydroMist products use?
Each nozzle uses roughly 1 gallon of water per hour. The total amount of water used per hour is roughly equal to the number of nozzles in the entire system.
When looking at Pump Module or Fan Pump Unit specifications, the pump GPM is not the absolute and constant output, it is merely the maximum output that the pump is able to handle. In other words, the pump can output less GPM than stated when the total number of nozzles attached is less than the maximum allowed for that pump.
For example: A 0.5 GPM Pump Fan Unit with 8 nozzles (HMI-2405-8) will use around 8–10 gallons of water per hour, not 30 (the pump output is a maximum of 30 GPH.) Using the same pump with satellites for a total of 20 nozzles on all fans will use around 20–25 gallons of water per hour. If more nozzles are needed to cool a very large area, a bigger pump capacity (such as 1.0 GPM) will be required -or- another system has to be created with another pump.
Unless otherwise instructed by a properly trained HydroMist representative, do not attach multiple pumps into the same connected system.
Are misting system effective in high humidity?
If properly designed and installed, a high pressure (1000 PSI) mist cooling system can be very effective for residential, commercial and industrial applications even in high humidity. Various geographical regions have specific summer weather inherent to their climate. When designing a system you must take into account the specific conditions associated with the area you are trying to cool. For example, in arid conditions more water can accepted into the air than in a more humid environment. HydroMist™ engineers can help in determining the proper water flow levels for your region.
Are high pressure pumps really necessary?
Yes, high pressure pumps allow for the creation of a mist that will evaporate faster, without getting you wet.
HydroMist's misting systems use high pressure pumps (1000 psi) and misting nozzles with very small holes (0.008".) Very small misting holes require the high pressure pumps to expel water as a very fine, fast evaporating, mist or fog.
Low pressure systems are not be able to expel water from very small holes, therefore large holes are necessary in the misting nozzles. The combination of low pressure and large misting holes results in large water droplets, which do not completely evaporate—this can often produce the appearance of "spitting" or “raining” upon people causing them to get wet.
High-pressure systems use less water, compared to low-pressure systems with a similar nozzle count.
How many fans do I need?

The following answer is a generalization. Speak with a HydroMist representative to help find a solution for your needs.

If you are indoors or in a location that is blocked from the wind, use the CFM of the desired fan and the volume of the space to determine the amount of fans. (Keep in mind they need an air inlet and outlet for air flow.)

Use this formula:

  • Fans Needed=Volume/(Fan Volume x Transfer Time)

Calculate volume:

  • Example: Factory 50ft x 80ft x 15ft = 60,000 cubic feet

Choose a fan (See Chart Below):

  • Example: Choose 30” fan. CFM = 10000

Choose time to transfer the total volume of air for the space being cooled.

  • Example: Every 2 minutes (I recommend time between 1-3 minutes.)

Determine fans needed:

  • Example: 60000/(10000 x 2 mins) = 3 fans

Fan Chart

PN Size Description CFM
F10-01-004 20" 20" Cage Fan, Single Speed 5500
F10-01-005 24" 24" Cage Fan, Single Speed 8000
F10-01-008 24" Multi-Speed, Oscillating 6800/1100
F10-01-008 24" Multi-Speed, Non-Oscillating 6800/1100

If you are in the open outdoors, the wind affects this calculation directly correlating with the transfer time. This makes it difficult to use this calculation.

What is the significant difference between misting fans and misting lines?
The two most accepted mist applications are the misting line and the misting fan. The mist line is comprised of a series of misting nozzles in-line with one-another. This creates a curtain of mist which will cool the air. However a mist line relies on nature’s movement of air to cool the surrounding areas. A mist line is usually installed around a perimeter of a building or in an open (non-covered area). Mist lines will produce an ambient temperature drop of about 5-10 degrees. Mist lines work well in dry climates; they however are not as effective in humid climates.
A Misting Fan utilizes “flash evaporative cooling.” By introducing a mist system into the front of a fan, you are moving the mist (flash evaporation) over a larger more direct area. The air movement generated by the fan creates a wind chill which will lower temperatures by as much as 25 degrees. When trying to cool a humid environment the mist fan is much more effective than a misting line. HydroMist™ specializes in the manufacturing of portable and mounted misting fans.
What is the key difference between a low pressure mist system and a high pressure misting system?
A low pressure mist system is based on using standard hose or tap pressure (30-60psi). Although inexpensive (Less than $500) they lack the key element that makes misting effective. These systems, which are typically sold in home centers and big box stores are also known for getting you and the environment “wet”. Without high pressure the water cannot be atomized into small droplets, which causes the cooling effect of “flash evaporation”. High pressure mist systems operate at 1000psi or more, thus enabling the water to be vaporized and ensures the driest and most effective cooling possible.
Are there any other benefits to a misting system?
Besides comfort, the two biggest benefits are Environmental and Safety. Most high pressure misting systems use very little water and energy but in turn can create a cool environment that will cost you much less than AC and much cleaner than the use of a “swamp cooler.” A misted and cooled area, large or small has less dust, reduces odor, and is abatement to flying insects. Misting can also greatly reduce the risk of heat illnesses. Whether dealing with excessive heat on a football field, in a steel mill or factory, or on your back patio, misting can be a great solution in preventing heat exhaustion and heat stroke.
What do I need for a home installation?

This is a basic idea on how to create a system. Please discuss planning with your local dealer to determine the optimal system for your environment.

1) Plan Your Area

Determine the cubic feet of the area to be cooled, where to place the pump and where to mount the fans.

  • The pump needs power, water source and drainage.
  • Fans need power connections.

2) Choose Your Fans

Determine the size and quantity of fans you wish to install, based on the cubic footage you wish to cool.

  • Do you want the fans to oscillate?
  • Will you need strong fans to overcome much wind?

3) Select Your Pump

The more nozzles your system has, the larger the pump will need to be.

  • A standard duty pump can easily handle 2 or 3 small fans.
  • Consider a larger pump for future expansions.

4) Get Mounts, Hose & Accessories

Select fan mounting brackets appropriate for placement. Get enough hose and fittings to daisy-chain the pump and the fans to each other.

  • Have a bottle of oil ready (first 50 hours!) as well as spare filters and misting nozzles.
  • Don't forget the hose mounting clamps!
How do I reset the service mode on the ProMist 75 and 100 pumps?

When the pump's total running time reaches 300 hours, the maintenance icon displays and the alarm sounds. This status does not stop normal operations of the pump, but it is highly advised to perform maintenance at this time.

Please review the entirety of the following instructions before beginning.

To reset the maintenance notification:

  1. When the machine is standing by, press and hold the (MODE) button and the (TEMPERATURE) buttons at the same time for 3 seconds, then the system enters into service mode.
    • While in service mode, the system automatically returns to normal mode if no buttons are pressed for 15 seconds.
  2. Press the (ENTER) button to cycle through service modes 1, 2 & 3. The mode will be displayed in the top left corner of the screen.
    1. Go to mode 2.
    2. Press and hold the (DOWN) button for 3 seconds.
    3. Maintenance notifications are now reset.
  3. To return the system to normal operation, you may press the (MODE) button or wait 15 seconds for service mode to time out.
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