For the person who knows that every old house has a story—and probably a suspicious draft. This glossy black mug features a vintage-style “Hot Rooms, Cold Rooms. Mystery Airflow.” design, complete with a retro HVAC illustration and a touch of dry humor. It brings a little character to early-morning coffee, late-night troubleshooting, and conversations about strange noises behind the walls. Available in 11 oz and 15 oz sizes, it has a comfortable C-shaped handle and works safely in both the microwave and dishwasher. A fitting companion for HVAC professionals, maintenance crews, home inspectors, and anyone who appreciates a good mystery with their morning brew.

Product features
– Glossy black ceramic construction with a crisp, vibrant printed design
– Available in 11 oz (0.33 L) and 15 oz (0.44 L) sizes
– Microwave-safe for convenient heating
– Dishwasher-safe for easy cleanup
– C-shaped easy-grip handle; lead- and BPA-free

Care instructions
– Clean in dishwasher (put the product on top rack), or wash by hand with warm water and dish soap

	11oz	15oz
Height, in	3.86	4.72
Diameter, in	3.35	3.35
Diameter (with handle), in	4.72	5.12

mystery air flow mug

HVAC Tech Coffee Cup — “Hot Rooms. Cold Rooms. Mystery Air Flow. Just Another Day In HVAC.” Black Coffee Mug (11oz/15oz)