Can you wire thermostats in parallel?

You may not be able to wire two thermostats exactly in parallel, but using multiple wall thermostats or temperature sensors to control one individual heating or cooling zone is easier than you might think.

Which wire controls the fan on a thermostat?


Some of the other wires powering your thermostat include: R-wire – Power, usually red. G-wire – Fan, usually green. Y-wire – Cooling, usually yellow.

What is thermostat in blower?

The fan setting on your thermostat controls your HVAC’s system blower. The blower helps circulate hot or cold air throughout your home until the temperature on the thermostat is reached. There are two settings on your thermostat to control the fan – auto or on.

Can an air conditioner have two thermostats?

Yes, in principle, you can use two thermostats to control one HVAC zone. If correctly installed, set, and used you can actually save on your electricity bill. You can also connect more than one thermostat to a single HVAC unit.

How do two thermostats work together?

When multiple thermostats control one system, the house is divided into zones using dampers in the ductwork throughout the house. When one zone needs heating or cooling, the damper for the ductwork in that zone opens, guiding the warm or cool air to that zone.

What color wire controls fan on thermostat?


This is the most typical thermostat wiring style, and it applies to systems that regulate both heat and air conditioning. The wires are typically arranged as follows: red for 24-volt hot, white for heat, yellow for cooling, green for the fan, and blue for common (although the common wire may be a different color).

What is the green wire for on a thermostat?

The green wire underneath your thermostat connects to the fan of your furnace or air handler. It terminates at the air handler or furnace. The green wire connects to terminal G on your thermostat.

What is the Blue C wire on a thermostat?

The blue wire, or C-wire, is known as the common wire. It’s there to provide power to the thermostat. Older thermostats usually don’t have a C-wire because they either don’t need power or, if they do, they get it from a battery. Modern thermostats are a different story.

How do you balance upstairs and downstairs temperature?

Keep the air moving by turning on the fan setting of your home’s thermostat. Turn the fan from “auto” to “on”. The fan will circulate the air continually throughout the home and can help even out temperatures between floors.

How do you wire a second thermostat?

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Can one thermostat control multiple zones?

With a smart thermostat for multiple zones, you can set up multiple different zones around your house. Following that, you can use your smartphone app or remote control to set different temperatures for all different rooms. That means everyone can have their way and no one needs to compromise.

How do you regulate heat in a two story house with one thermostat?

Set the first floor’s thermostat to your desired temperature, and then decrease the temperature setting on your thermostats by two degrees as you go up. Warm air on the first floor will rise and make the upper floors more comfortable.

How do you install a dual thermostat on a two story house?

The general rule of thumb for a two-story home is that you should set each thermostat two degrees Fahrenheit apart from the other. During the summer, when your AC is running, set the upper floor at the temperature you actually want in your home. Then set each floor underneath that to two degrees warmer.

How do you wire a multi zone heating system?

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What happens if you wire a thermostat wrong?

Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.

What are the wires on a zone valve?

A 2-port (or Zone valve) has a permanent 230v supply (usually on the grey wire) plus a Neutral and an Earth wire. There is then also a Motor Live wire (usually the brown) and a Switch Live wire (usually the orange).

Do zone valves go on supply or return?

In most installations, the zone valves are in the returns, where the water is cooler. The cooler temperatures are easier on the valves. It has been the practice of some to place them in the supply using a manifold just above the boiler; this is often in conjunction with the “pumping away” concept.

What happens if a zone valve is installed backwards?

Zone valves are designed to close gently while opposing the force of the water flow in the pipe. Most are spring loaded. If the valve is installed backwards, the flow of water catches the closure ball, overrides the spring, the valve snaps shut, and the water slams to a halt.

Why are control valves on the return side?

When a control valve is installed on the return side, the water is at a higher pressure through the coil, reducing off-gas, thereby lowering dissolved oxygen content compared to a supply installation.