Thermostat Installation and Service in Silver Spring

Shemtov Systems installs, replaces and troubleshoots thermostats across Silver Spring and Montgomery County, MD, including smart thermostats and the wiring they need to work with heat pumps and multi-stage equipment. Call 240-355-3333.

THERMOSTATS

Easily manage your home comfort. With our wide variety of highly engineered thermostats, wireless thermostats and Thermidistats including our all-star Infinity® Control you have precise control over temperature, humidity, air treatment and scheduling. It’s the advanced heating and cooling innovation you’re used to from the experts at Carrier.

Thermostat Products

Shemtov Systems offers a range of solutions for managing your system. Whether you’re looking for a programmable thermostat or a basic thermostats – we can supply you with it.

We Service

The following areas for HVAC, Heating & Air Conditioning Services for both Commercial & Residential

Shemtov Systems installs, replaces, rewires, and troubleshoots thermostats throughout Silver Spring and Montgomery County. A thermostat replacement is low voltage wiring and equipment configuration, not a faceplate swap, so a control that looks compatible on the box can still fail on the wall. We check the cable, the transformer behind it, and the equipment settings, then run every mode before leaving. Call 240-355-3333 to schedule an installation or a diagnostic.

Key takeaways

The cable in the wall and the equipment control board decide which thermostats your system can accept.
Houses here wired before the 1990s often have four conductor cable and no common wire, the usual obstacle to a connected control.
Commissioning is the step that gets skipped: equipment type, stage count, fan behavior, and changeover all have to be set and tested.
A blank display, a system that never shuts off, and a room that never settles are three different faults with three different causes.

What is involved in a professional thermostat installation?

We cut power at the furnace or air handler, then photograph and label the existing wires at their terminals rather than by color, since color conventions are unreliable in older houses. We confirm the transformer can carry the new load and mount the base level on an interior wall away from registers and lamps. Then we set equipment type, stage count, fan behavior, and cycle rate, and test each mode.

What is a C-wire, and why do so many older homes here lack one?

The C, or common, wire completes the 24 volt circuit so a thermostat has continuous power instead of borrowing it through the heating and cooling wires. Houses around Silver Spring and Wheaton built before the 1990s commonly have four conductor cable, enough for a furnace and air conditioner but nothing spare for a connected control. Power stealing covers that gap badly, causing Wi-Fi dropouts, reboots, and chattering relays. The fixes are new cable, a wire adapter, or a power extender module.

How is a thermostat set up for a heat pump?

Heat pump setup is where most configuration mistakes happen. The reversing valve output must match the equipment: Carrier and Bryant energize it in cooling, some brands in heating, and reversing that makes the system heat when you call for cooling. Auxiliary and emergency heat take their own terminals, and lockouts decide how cold it must get before strips or a furnace may run. On dual fuel we also set the outdoor switchover point, then prove each stage alongside heat pump service.

Can a thermostat be moved to a better spot?

Yes, and it is often the real fix when a room never settles. A control above a supply register reads the air coming out of it and shuts down early, while one on an exterior wall or in sun reads the house wrong the other way. Relocating means running new low voltage cable to a better interior wall, patching the old opening, and reconfiguring the control. Where the wall cannot be opened, a remote room sensor is usually cheaper.

Why is my thermostat not controlling the heating or cooling?

Start by separating a dead control from one being ignored. A blank screen points to dead batteries, a blown low voltage fuse, a tripped condensate float switch, or a blower door left ajar, since any of those cuts the 24 volt supply. A system that will not shut off usually traces to a stuck contactor, a low voltage wire chafing on sheet metal, or the fan switch left ON.

Frequently asked questions

Can I install a smart thermostat myself?

Many homeowners do, and it goes smoothly on a furnace and air conditioner that already has a common wire. It gets harder with heat pumps, two stage equipment, and dual fuel, where the wiring looks similar but the configuration is not. Shorting the low voltage wires blows the transformer fuse.

What should I photograph before pulling the old thermostat off the wall?

Take a clear picture of the terminals with the lettering visible, then a second from the side showing which conductor lands where. Record the terminal letters rather than the wire colors. If a jumper links two terminals, capture that too, since it shows how the equipment was configured.

My thermostat screen is blank. What should I check first?

Check the batteries if it uses them, then confirm the equipment service switch is on, the blower door is fully closed, and the condensate pan is not holding a float switch open. If the screen stays dead, the low voltage fuse has most likely blown, and the short that blew it must be found first.

Talk to Shemtov Systems

To have a thermostat installed, rewired, relocated, or diagnosed in Silver Spring, Bethesda, Rockville, Olney, or anywhere in Montgomery County, call Shemtov Systems at 240-355-3333.

Homeowner guides

Straight answers to the questions we hear most from Montgomery County homeowners.