Performance
Development efforts this summer (of ’23) focus on further improving features, performance and reliability for the next release (R2). I’m excited by the results. Hopefully this picture explains why. It shows the variation in the output air temperature, most of the time within +/- one degree. This, while the outdoor temperature increased by over 20 degrees, to a high of about 107. This level of performance can’t be expected every day. Occasional clouds and especially rain cause sharp outdoor temperature changes which, as you can see by the response to the set temperature change, can take 10 or 20 minutes to recover from. I will try to capture data showing this later this summer when the monsoons arrive (assuming they do).

If that didn’t do it for you, maybe this will: on this day, the Roadrunner Comfort held the output air temperature within +/- one degree 94% of the time, including through a two degree set temperature change (at ~11:18 above). It did take 10-15 minutes to warm back to normal operation after the set temperature change, which is about as quick as anyone can hope for with pads already quite wet on a hot day. The pads must dry out to reduce cooling (raise the temperature), which takes a few minutes.
All 15 readings more than 1.5 degrees below the set temperature occurred immediately after the set temperature was raised two degrees. If we ignore those readings, the temperature is regulated to within +/- 1.5 degrees 99% of the time. (Our other cooler, an old Tradewinds, did even better, meeting that target 100% of the time!)

Specifications
- Power consumption (controller):
- 3W absolute maximum
- 0.5W idle
- 1.25-1.5W typical operating
- Temperature accuracy:
- +/- 0.75 degrees Fahrenheit maximum
- +/- 0.5 degrees typical
- Long term temperature drift: less than .05 degrees F / year
- Temperature sample interval: 1 minute
- Temperature set range: 45-95 degrees F
- Display: TFT LCD touchscreen module, 320×240 pixels
- Bluetooth sensor range: greater than 30 feet
- Wifi remote access: home network only
- Remote app: iPhone store, “RoadrunnerComfort”
- Remote app cost: free
- Sensor battery life: expected 5+ years; observed 2+ years
- Sensor battery type: CR2477 coin cell
- Absolute maximum current, fan high: 15A
- Absolute maximum current, fan low: 10A
- Absolute maximum current, pump: 2A (typical pump draws 1A)
- Enclosure material: Polylactic Acid (PLA) plastic, 3D printed
- Warranty: 1 year parts and labor
Screens (release R2)
OFF Screen (starting point)

Auto takes you to automatic operation.
MaxCool runs pump and fan full time for coldest possible air
Manual takes you to manual controls
Option takes you to the Option screen
ON at time appears only if a turn-on time has been set
ON Screen (automatic operation)
Air blows at the Set Temperature (shown here as “75”)
Fan turns ON and OFF automatically
LOW (or HIGH) indicates current fan speed
WARMER raises set temperature
COOLER lowers set temperature
Fan appears when the fan is running
Pump appears when the pump is running
Sensor shows current temperature of incoming air
OFF at time appears only if a turn-off time has been set

MANUAL Screen

Manually switch Pump, Fan, and fan Speed
Back returns you to the OFF screen
Shown: Pump off, Fan on low
OPTION Screen
Done returns you to previous screen (OFF or AUTO)
ON time lets you set a daily automatic turn-on time
OFF time lets you set a daily automatic turn-off time
SETUP takes you to the Setup screen
Currently shows current time

Setup Screen (no Wifi connection)

With no wifi connection, the SETUP screen looks like this
Back returns you to the OPTION screen
Rotation enables the controller to be installed horizontally or vertically
Select Wifi to connect to Wifi. Required for iPhone remote control and auto clock set.
Clock takes you to a Set Clock screen. You MUST set the clock for proper operation when there is no Wifi
The Bluetooth button starts the sensor pairing process. The button on the sensor needs to also be pressed to pair (please see sensor installation instructions)
SETUP Screen (Wifi connected)
Back returns you to OPTION screen
Rotation enables the controller to be installed horizontally or vertically
Wifi is for entering network name and password
Update enables reprogramming via Wifi
Bluetooth button turns blue when paired
Address is used to setup the iPhone app
Sensor Battery shows remaining charge
Cyan text is serial number and firmware version


Wifi Credentials Entry
Familiar keyboard, simple navigation
Done returns you to the previous screen

Set ON/Off times, Clock
Slide ‘rollers’ up and down to change setting.
Done returns you to OPTION screen
Clear disables Turn ON or Turn OFF time
Tips & Tricks
Leave the Roadrunner Comfort (RRC) ON and it will ramp up as the morning warms and wind down as the evening cools.
The fan will sometimes turn ON or OFF for just a minute or two in the morning or evening (and at night if it’s been hot). This is normal. When the outdoor temperature is warmer than indoors, the fan will run nearly continuously.

Sometimes the RRC needs a reset to keep working properly. The RESET button is on the side of the wall unit. It’s always OK to reset RRC, it remembers ALL settings and restarts promptly.


The sensor clipped to the vent uses a battery that will last many years. When it needs changing (but with time left to get a replacement), a message will appear on the cooler display. When the battery is on the verge of failing, the message will be flashing and the controller will beep once a minute. “CR2477 ” is the battery type.