SPIKE STOPPER Split Phase 120-Volt/240-Volt Whole House Surge Protector SM05B221ET - The Home Depot
Why You Need HVAC Surge Protectors | Carolina Comfort
How To Install A Surge Protector on Your AC Unit - YouTube
Intermatic IG1240RC3 - AC Surge Protector - Single (Split) Phase - Type 1 or 2 SPD - Hardwired - 50kA Max. Capacity - 120/240 Volt - NEMA 3R Indoor/Outdoor Enclosure
Surge Protection for Heat Pumps - GreenBuildingAdvisor