EMERSON Classic 70 Series 1F79-111 Thermostat | Montreal, Laval, Longueuil, South Shore & North Shore
On a heat pump with backup heat, you want a no-schedule control where Heat, Off, Cool and Emergency are picked right on the mode switch.
Quick facts
On a central heat pump, sometimes you just want a thermostat that gets to the point: one setpoint, a mode switch and an Emergency position within easy reach. From EMERSON’s earlier White-Rodgers Classic 70 series, the 1F79-111 offers exactly that, with no programming. In its 2025 cross-reference table, the brand lists the EMERSON 70 Series 1F75H-21NP to replace the 1F79-111.
A no-nonsense heat pump thermostat
- Stages: 2 heating, with backup, and 1 cooling.
- Mode switch: Heat, Off, Cool and Emergency, plus fan control.
- Calibration: the room temperature reading can be adjusted.
- Power: hardwired, with backup batteries.
- Terminals: O/B, Y, L, E, C, R, G and W2.
- Display and setpoint: large lit display; setpoint from 7 to 32 °C (45 to 90 °F).
Which installations?
It is designed for 24 V central heat pumps with backup heat. A furnace on its own needs a conventional thermostat. Hot water and steam systems are outside its range, as are baseboards, convectors, fan-forced heaters, electric floor heating and wall or ducted heat pumps. Dual fuel is not confirmed for this model; we check it at the estimate.
Next to its neighbours
The EMERSON 70 Series 1F75H-21NP, also non-programmable, runs on 2 AA batteries or can be hardwired and goes up to 37 °C; its sheet lists adjustable differentials and a dual-fuel logic option, and its terminal list has no L. In the same Classic 70 series, the EMERSON Classic 70 Series 1F72-151 is a 5-2 day programmable heat pump model, with emergency heat and fan Auto or On.
Estimate, then installation
Since the 1F79-111 is hardwired, we check for a common wire (C terminal) at the free in-home estimate. On installation day, we fit the backup batteries, connect the heat pump and its backup, adjust the calibration if the reading drifts from the room temperature, and test every switch position.
Manufacturer document: brand 2025 cross-reference table (R-4538-9). Sold and installed by AirGreen. We serve Montréal, Laval, Longueuil, the North Shore and the South Shore.
Key facts: EMERSON Classic 70 Series 1F79-111
Four things to know, then its ID card in twelve answers. “—” means the manufacturer does not publish it.
Is the EMERSON Classic 70 Series 1F79-111 compatible with your heating?
Two steps, thirty seconds. The verdict takes your system and your wiring into account.
Full compatibility table
The terminals behind the thermostat
Tap an element to see what it does. A working diagram, not a substitute for the manufacturer’s installation guide.
Try the EMERSON Classic 70 Series 1F79-111 before you buy
Raise the setpoint, change the mode: see how it responds.
Winter, Rate Flex D and rebates: what this thermostat changes
With Hydro-Québec’s Rate Flex D, electricity costs less most of the winter and more during a few peak hours. Turning the setpoint down a few degrees during those hours is what counts.
The EMERSON Classic 70 Series 1F79-111 or its closest sibling?
The most useful comparison: the model right next to it in our catalogue.
The right thermostat in three questions
If this model is not the right one for you, the page says so and shows you which one is.
Installed and set up by our technicians, in five steps
What we do at your place, in order. The on-site estimate is free.
- 01InspectionEquipment, stages to control and existing wiring.
- 02C wireCommon wire added if the model needs it and it is missing.
- 03MountingWall base, terminal wiring, cover plate if needed.
- 04SettingsEquipment type, stages, dual energy and accessories.
- 05Start-upConnection, app, schedule and tests with you.
EMERSON Classic 70 Series 1F79-111 specifications
From the manufacturer’s sheet. Type a word: the list filters as you write.
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Frequently asked questions about the EMERSON Classic 70 Series 1F79-111
Short answers, no detours.
What does the EMERSON Classic 70 Series 1F79-111 work with?
According to the manufacturer’s sheet: heat pump; 24 V.
Does it need a C wire?
Yes. It needs wired 24 V power with a common wire. If the wire is missing, our technicians add a conductor during installation.
Can it control electric baseboards?
No. It is a low-voltage (24 V) thermostat. 120/240 V baseboards need a line-voltage electronic thermostat.
Can it be controlled remotely?
Not directly: it has no built-in Wi-Fi.
Does AirGreen install it?
Yes. We sell and install this product in Montréal, Laval, Longueuil, the South Shore and the North Shore. The on-site estimate is free.
No question matches. Call us at 514 316-2973.
Your thermostat, installed and set up by our technicians
We check your system and wiring, install the thermostat, connect it and program it with you. One visit, one installed price.