Reddit reviews HDE Non-Contact Infrared Thermometer Digital Laser Surface Temperature Gun with Backlit LCD Display - Range -58°F - 716°F (-50°C - 380°C)

Sure it could be condensation. A non contact thermometer may help you:

https://www.amazon.ca/HDE-Non-Contact-Infrared-Thermometer-Temperature/dp/B009RUPQGW

If that area is cold, the moisture could be condensing on it.

This is the one I got, works great

https://www.amazon.com/dp/B009RUPQGW/ref=cm_sw_r_awd_5G.mub0AB8NWB

Get a cheap thermo gun and test the walls, ceiling, and door seals for temp spikes. This will reveal air leaks and problem areas. I suspect your metal garage door is the biggest culprit of heat loss. This winter I installed an [insulation kit] (http://www.amazon.com/Atlas-EPS-S-GDIK001-Insulation-Universal/dp/B008OPLHVE/ref=sr_1_1?ie=UTF8&qid=1398097268&sr=8-1&keywords=garage+door+insulation+panels) on my garage door and it kept my garage a few degrees warmer. I'd imagine this would help block out the Texas summer heat too.

All sensorless brushless motors are virtually waterproof but they should still be dried out after being submerged. The best way for me is to run it for a while to let it dry then spraying a little lubricant in afterwards. Do not trust the ESC to be waterproof, that's the mistake I made with mine. There are plenty of videos on Youtube that demonstrate how to do it.

Invest in one of these temp guns because they'll save you more money down the road. Checking by hand isn't very helpful because anything over 120 will feel very hot. Your motor can go up to 180 and the ESC can go up to 160.