Time to upgrade your thermostat? By bsadmin Posted on April 4, 2016 If a thermostat uses a dial or lever, it likely contains 2 to 4 grams of mercury. If you want to upgrade your old, mercury-containing thermostat, ask Bayside about your HVAC system’s needs to make sure you get the right device for your home. Post navigationPrevious post: A customer recently asked if we could “spray this for rust!”Next post: Call Bayside for a special 64-point AC system check-up today!