To the pump and fanTo your thermostatMonsoon is an adapter box for evaporative coolers. It runs the pump and both fan speeds and wets the pads before the fan starts, so an ordinary smart thermostat can control the cooler.
Ships spring 2027. No payment today.
Monsoon goes in at the cooler and connects to the thermostat over the wire you already have, so you can put up whichever smart thermostat you like. Your thermostat's app, schedules and voice control keep working. We confirm your exact model before you pay.
It replaces the old relay box or switch wiring. Do it yourself, or have a licensed pro install it.
Monsoon runs over the thermostat wire you already have. In most homes there's no new wire to pull.
Any of these, or another standard 24V smart thermostat.
Evaporative cooling is cheap to run and works well in dry heat. The switch that controls it can't hold a temperature or follow a schedule, and a smart thermostat can't connect to the cooler on its own.
| Feature | Old wall control | Monsoon + smart thermostat |
|---|---|---|
| Set a temperature, not a fan speed | No | Yes |
| Schedules and away mode | No | Yes |
| Start cooling from your phone | No | Through your thermostat's app |
| Pads soaked before the fan starts | You wait, then switch | Automatic |
| Fan-only for cool or humid evenings | Flip the switch | Thermostat fan mode |
| Alexa, Google Home, HomeKit | No | If your thermostat supports it |
| New account or subscription | None | None |
A smart thermostat switches 24-volt signals, while a cooler's pump and blower run on 120 or 240 volts. Monsoon reads the thermostat's calls for cooling and fan, then switches the pump and fan speeds itself. Pick a setting below to see which wires carry current.
What is the thermostat asking for?
Thermostat is calling for Cooling (Y1). Cooler is running Pump and fan on low.
Once the pads are wet, the blower starts on low and the pump keeps running.
Monsoon mounts at the cooler, on the roof or beside the house, so the enclosure is built for summer heat and storms.
Read the status lights without opening the box.
Runs around the whole rim to keep out dust and rain.
Powers your smart thermostat, so you don't need to pull a new C-wire.
Rated 16 A at 250 V for motor loads. Low and high are interlocked.
Run the pump, low or high at the cooler while you check the wiring.
Sets the pump to run 2, 4 or 6 minutes before the fan starts.
Cooler wiring on the left and thermostat wires on the right. The line side has a fuse and surge protection.
Seal the openings where the cables enter the box.
Early pre-orders get founder pricing and ship before cooler season. You don't pay anything today. We'll email a checkout link before your unit ships, and you can cancel anytime.
For homeowners comfortable with line-voltage wiring.
$169Regular price $199
Founder price for early pre-orders
Installed and tested by a licensed local HVAC pro. Install crews launch first in the metros with the most pre-orders.
$399Regular price $449
Founder price for early pre-orders
Cooler or HVAC contractor?
Offer smart thermostat upgrades on your spring start-up visits, with wholesale pricing and install support.
Version 1 is designed for conventional whole-house evaporative coolers that have a separate water pump and a one- or two-speed blower motor, on 120V or 240V. Down-draft and side-draft units both work.
Champion / Essick Air, MasterCool, Hessaire, Phoenix / Frigiking, Bonaire Durango, and other conventional units.
Answer the three questions to see if your cooler fits version 1.
Not directly. Nest and other smart thermostats send low-voltage 24VAC signals, while a swamp cooler's pump and blower motor run on 120 or 240 volts and need pad pre-wet logic that thermostats don't have. Monsoon sits between the two. It powers the thermostat, reads its cooling and fan calls, and switches the pump and motor speeds.
It's designed for any conventional 24V thermostat that can be set up for one- or two-stage cooling, including Google Nest, ecobee, Honeywell Home, Amazon and Emerson Sensi models. We'll publish model-by-model setup steps before delivery.
Usually not. Monsoon needs four or five conductors between your thermostat and the cooler: R, C, G and Y1, plus Y2 for two-speed control. The cable that fed your old wall control can often be repurposed for low-voltage use, and heavier conductors get short pigtails so they fit your thermostat's terminals. Your installer confirms it meets local code.
When the thermostat calls for cooling, Monsoon runs only the water pump for a few minutes (2, 4 or 6, set on the board) so the pads are soaked before the blower starts. You get cool air from the first minute instead of a blast of warm, dusty air.
Version 1 is designed for conventional whole-house evaporative coolers with a separate water pump and a one- or two-speed blower motor, on 120V or 240V. That describes many down-draft and side-draft units from brands like Champion / Essick Air, MasterCool, Hessaire, Phoenix and Bonaire Durango. Coolers with proprietary electronic controls, such as many Breezair models, and variable-speed motors aren't supported in v1.
That's the goal for homes where the furnace and cooler share a thermostat location: the thermostat heats through the furnace as usual and cools through Monsoon. Wiring varies a lot here, so tell us about your setup when you pre-order and we'll confirm it before you pay anything.
Homeowners comfortable with line-voltage wiring can install the DIY Kit where local code allows, using the wiring guide for their cooler. Paid cooler installs generally require a licensed contractor across the Southwest (in New Mexico, for example, they fall under MM-3 HVAC licensing), so the Installed option is always done by a licensed local HVAC professional. Always shut off power at the breaker and the cooler's disconnect first.
Monsoon is still in development. The production unit is being designed for third-party safety listing (UL or ETL), and we plan to have it listed before delivery. We'll share the listing details before we charge anyone.
Pre-orders are scheduled for spring 2027 delivery, ahead of cooler season. You don't pay anything today. A pre-order reserves your founder price and your place in the first production run. We'll email a checkout link before your unit ships, and you can cancel at any time.
No. Monsoon has no app, account or cloud service of its own. Scheduling, remote control and voice assistants keep working through your thermostat's own app.
It takes about a minute. Pre-orders ship spring 2027, and nothing is charged until your unit is ready.