Nest Learning Thermostat

[Neutron]

My furnace is origional from 1938 we have no cooling in the house. I replace the thermostat a few years ago, but can't remember how many wires it had, it was 2 or 3.

A/C is just about a requirement where we live. Too bad heat during the winter is too. The house we are renting needs more weatherproofing as our gas bill for a 1500 sq ft house was over $150 this past month.

 

[StevenD]

My furnace is origional from 1938 we have no cooling in the house. I replace the thermostat a few years ago, but can't remember how many wires it had, it was 2 or 3.

The other thing you can do is just run a 24v transformer (like for a sprinkler system) to it. I happen to have a closet behind my thermostat downstairs, so if I didn't have the extra wire, I planned just putting in a transformer in the closet and poking a hole through the Sheetrock to the thermostat.

 

[Scott Greczkowski]

Nope don't have it.

 

[morganb]

I don't have a C wire. I have G, Y, W, and R and I was able to install my Nest just fine. I guess one of the wires carries the power. I know nothing about HVAC systems so I don't know what the wires do.

 

[Frank Jr.]

Nope don't have it.

I can't be sure but ..... Take a look at the thumbnails. Looks promising.

 

[Frank Jr.]

I don't have a C wire. I have G, Y, W, and R and I was able to install my Nest just fine. I guess one of the wires carries the power. I know nothing about HVAC systems so I don't know what the wires do.

Rh Red -24 Volt Hot for Heating
Rc Red -24 Volt Hot for Cooling
Y1 Yellow -First Stage Cooling
Y2 Blue -Second Stage Cooling
G Green -Indoor Fan
W1 White -First Stage Heat
W2 Black -Second Stage Heat

(not sure for a Heat Pump)

 

[stimpson]

Rh Red -24 Volt Hot for Heating
Rc Red -24 Volt Hot for Cooling
Y1 Yellow -First Stage Cooling
Y2 Blue -Second Stage Cooling
G Green -Indoor Fan
W1 White -First Stage Heat
W2 Black -Second Stage Heat

(not sure for a Heat Pump)

What's the "W" for? I just see W1 & W2.

 

[Frank Jr.]

What's the "W" for? I just see W1 & W2.

W or W1 White - First / Single Stage Heat

 

[stimpson]

W or W1 White - First / Single Stage Heat

Gotcha. Thanks.

 

[stimpson]

Being the gadget nerd that I am, I would get it. I live in a two story house and have two independent ECS units. Not gonna shell out 250 x 2.

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I lied. Just ordered 2 this morning.

 

[parp]

I wanted to get one of these when I first heard about them, but I have a heat pump with a gas furnace (very common here). Was told they don't work with dual fuel systems...

 

[stimpson]

I wanted to get one of these when I first heard about them, but I have a heat pump with a gas furnace (very common here). Was told they don't work with dual fuel systems...

I have a heat pump with gas. The only option I will loose is "emergency". I have only had to use it 2 times in th 5 years I have lived in my house. I wont miss it. Pop the cover off of your thermostat and compare your connected wires using the compatability section on the Nest site. You can even take a picture of you connections and email it to Nest and they'll let you know if you are compatable.

 

[Ramy]

My furnace is origional from 1938 we have no cooling in the house. I replace the thermostat a few years ago, but can't remember how many wires it had, it was 2 or 3.

Are you serious? You need a new more efficient one.

 

[StevenD]

I lied. Just ordered 2 this morning.

What made you change your mind?

 

[stimpson]

What made you change your mind?

I'm a gadget nerd. Couldn't resist

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[truckracer]

heat pumps typically use the B or O terminal to energize the reversing valve.

most but not all heatpump reversing valves default in heat mode. so when your thermostat calls for heat (with a heat pump) Y or Y1 along with the O terminal are energized.

O terminal is reversing valve in cool mode +24 vac typical.

 

[truckracer]

I have a heat pump with gas. The only option I will loose is "emergency". I have only had to use it 2 times in th 5 years I have lived in my house. I wont miss it. Pop the cover off of your thermostat and compare your connected wires using the compatability section on the Nest site. You can even take a picture of you connections and email it to Nest and they'll let you know if you are compatable.

my new r410 A air source heat pumps produce decent heat down to 18F outdoor ambient.

i am an HVAC tech so i did my own installs. i paid close attention to airflow specs and refrigerant charge.

running goodman 14.5 seer units - one 4 ton and a 2 ton with 95% afue two stage gas furnaces.