Can I hook up two thermostats to one furnace?

Asked By: Celmira Malycha | Last Updated: 24th March, 2020
Category: home and garden indoor environmental quality
4.3/5 (1,619 Views . 39 Votes)
You want multiple zones on a single furnace. To achieve this you need more than an additional thermostat - you need electronically controlled baffles in your heating system. Both thermostats can call for heat, triggering the furnace to fire, and each thermostat controls one baffle.

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Regarding this, can you install a second thermostat?

You can help make a more evenly conditioned home by installing a separate thermostat in another part of the house. When two thermostats are wired to a heating or cooling system with a zone control and dampers installed in the ductwork, you have true separate temperature zones in your home.

One may also ask, can two thermostats control one AC unit? It is possible to install a single central air-conditioning unit, with two or more thermostats, that can cool the house equally. Each zone of the house can be turned down or closed off to save energy. The thermostat in each zone controls the temperature in the zone.

Considering this, can you link two Nest thermostats?

The short answer to the questions posed above is: yes. Nest thermostats can certainly be used in conjunction with zoned HVAC systems. However, you are indeed going to require multiple Nest thermostats throughout the house.

Does HVAC zoning save money?

System zoning can save homeowners up to 30 percent on a typical heating and cooling bill, according to the U.S. Department of Energy,. The savings can pay for the cost of installing a zoning system, possibly, within two to five years. There are not many HVAC items that can offer that kind of payback.

23 Related Question Answers Found

How many thermostats should be in a house?

System-Based Zoning
This means you have to have more than one thermostat. In fact, you'll likely have at least one thermostat per heater or “zone”. This is by far the most efficient and precise way of achieving energy savings through zoning.

How much does it cost to add a second thermostat?

For a standard, 2,000-square-foot home, the cost of installing or replacing a thermostat averages between $112 and $250, including the price of the unit and professional installation. The national average cost is $171. The thermostat will run between $15 and $300, depending on the type and its features.

Is zoned heating worth it?

Compared to most other heating and cooling methods, multi-zone temperature control is more costly to install. Although it's worth remembering a properly installed multi-zone temperature control system can save money on utility bills, the upfront cost won't be easy to digest compared to other methods.

Should upstairs thermostat be set higher than downstairs?

Instead, set your upstairs thermostat to your ideal temperature and then your downstairs one two degrees warmer. This will not only yield comfortable results all throughout your home, but really counteract the problem of upstairs rooms having to deal with so much more warm air.

Do I need 2 Nest thermostats for 2 zones?


If you currently have two thermostats controlling two zones you will want two Nest thermostats. You do not need to upgrade them both at the same time.

How many Nest Thermostats can one account have?

You can create as many Nest accounts as you wish, as long as each account uses a different email address. You can then create, or accept invitations for, up to two more homes with each account.

Can you use Nest in multiple homes?
Nest Thermostats Maximum of 20 per home
Nest Cams Maximum of 10 per home

How many Nest Thermostats can you have per account?

If you sign in to the Nest app with a Google Account, learn how to protect your account with 2-step verification.

How many products you can have in the Nest app.
Nest thermostats Maximum of 20 per home
Nest Temperature Sensors Maximum of 6 per thermostat Maximum of 18 per home

Where should a thermostat be placed in a two story house?

The rule of thumb to bear in mind is that warm air rises, while cool air sinks. Therefore, in a two-story house, the top floor will be warmer than the bottom floor. The ideal thermostat location is fairly high up on a first floor wall, which will help it find the average temperature.

Why is my house hot upstairs and cold downstairs?

Poor attic insulation, leaking air ducts and blocked soffit vents can also cause your home to have hot upstairs and cold downstairs. To check if your attic has sufficient insulation or not, look out for attic floor joists. If you can see any joist then your attic is not properly insulated.

Can a Nest thermostat replace any thermostat?


Google Nest thermostats are designed to work with most 24V systems, even older systems. They work with all common fuel types including natural gas, oil, and electricity. Your system may work with both the Nest Thermostat E and the Nest Learning Thermostat, or only one of them.

How do dual zone HVAC systems work?

Dual-Zone AC & Heating vs.
With a zoned system, one unit provides heating and cooling to multiple areas of your home. In a dual-unit system, you have two totally separate units that each operate a single zone with separate, unconnected thermostats.

Is it worth getting a Nest thermostat?

Why the Nest Thermostat is Worth the Money
Nest claims claims that its subtle, habit-changing features, when combined with its intelligent learning over time, leads to an average energy savings of $131-145 per year. You just made $35 by purchasing the Nest Thermostat!

Are upstairs cooler than downstairs?

Typically, rooms upstairs are warmer than rooms downstairs, and, oppositely, basement rooms tend to stay much cooler due to the fact they are underground; also, rooms that are on the side of your home that receives more sunlight than others will tend to be warmer and need more energy to keep cool.

Is 72 a good temperature for air conditioning?

The Ideal Summer Thermostat Setting
For most people, the normal comfort zone temperature sits around 72-73 degrees—but an air conditioner isn't a highly scientific machine. Setting the thermostat at 78 degrees typically keeps enough cool air in the room for comfort.

How can I cool my upstairs of a 2 story house?


How to Cool a Two-Story House
  1. Block off the second story from the ground floor.
  2. Buy a window air conditioner.
  3. Install heavy, insulating curtains on all upstairs windows, and keep them closed.
  4. Keep windows closed unless a cool breeze develops.
  5. Run a dehumidifier upstairs to take the humidity out of the air.

How do you set a thermostat in a two story house in the summer?

If your preferred temperature in the summer is 72 degrees, then set the downstairs thermostat to 70 and the upstairs to 74. Use the same two-degree difference in the winter, making sure the higher temperature is on the second story. If you have a three story home, a one-degree difference should work.

How do you keep hot air from going upstairs?

Use negative ventilation to move heated air out of the downstairs and vent it outside. Mount window fans to circulate air out of the house from the downstairs. Open upstairs windows to facilitate the air circulation, and the negative ventilation achieved downstairs will literally pull the upstairs air downward.