Johnstone Supply Store in HAYWARD webmaster1 May 15, 2021 Categories: HVAC WholesalersAddress 1497 ZEPHYR AVEHAYWARD, CA 94544USAContact Phone: (510) 285-1624Contact Store Review Store Your Name * Your Email * ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ Your Review *