Hours Of Operations ADT Connecticut Harwinton ADT Hours of Operation and Locations in Harwinton, CT 4.7 - 140 votes 1 Locations in Harwinton www.adt.com ADT Hours Category: Home & Garden ADT - Harwinton, CT 06791 (800) 238-2727 View Store Details Recommend For You Stacy Furniture Build-A Bear Workshop J. C. Penney 84 Lumber A.C. Moore Arts & Crafts Adams Golf American Standard American TV & Appliance Andersen Windows & Doors Andronico's Market