VIVOSUN 10"x20.75" Seedling Heat Mat with Built-in Temperature Controller, UL & MET-Certified Waterproof Plant Heating Pad for Germination, Hydroponics, Brewing, Breeding, and Greenhouses

They should be good room temp, but if you’re REALLY worried about them, i use these seed grow mats for my pods that need higher temps than my ambient. They do have other sizes available, i can fit 3 bins across this size. I keep them at the 90-100f range in the summer and 110-ish in the winter. The bins stay consistently in the 70’s. link