EMERSON Classic 70 Series 1F78-151 Thermostat | Montreal, Laval, Longueuil, South Shore & North Shore
A simple first programmable thermostat: one schedule for weekdays, another for the weekend, on batteries with no C wire.
Quick facts
Moving from a manual thermostat to a programmable one is often the first step toward a better-run home, as long as the schedule stays simple. The 1F78-151, an earlier thermostat from EMERSON’s White-Rodgers Classic 70 series, keeps it to two schedules: one for weekdays, one for the weekend. In its 2025 cross-reference table, the brand lists the EMERSON 70 Series 1F75C-11PR to replace the 1F78-151.
One schedule for weekdays, one for the weekend
- 5-2 day programming: the five weekdays on one side, Saturday and Sunday on the other.
- Battery powered: no C wire to run through the wall.
- Large backlit LCD: reads in °C or °F, your choice.
- Stages: 1 heat and 1 cool, 24 V, with fuel-fired or electric heat.
- Setpoint: 7 to 32 °C (45 to 90 °F).
- Size: 3-3/4 x 5-1/8 x 1-1/8 in., white case.
Compatible systems
On the heating side, the 1F78-151 suits a gas, oil or electric furnace; on the cooling side, central air. It can also run a central heat pump with no backup heat (1 heat, 1 cool), and it has O and B terminals. Dual fuel is not possible: it has no backup stage. Baseboards, convectors, fan-forced heaters, electric floor heating and wall or ducted heat pumps are out of its reach. Hot water and steam systems do not appear on its spec sheet.
Before you choose
The EMERSON 70 Series 1F75C-11PR offers a 7-day or 5-1-1 schedule with 4 periods per day, 2 AA batteries or a C wire, and a setpoint up to 37 °C; its sheet also lists millivolt and 24 V systems, a filter reminder and a built-in level. The EMERSON Classic 70 Series 1F78-144 is a no-schedule model of the same size; its sheet lists 2 AAA batteries and millivolt as well as 24 V.
Installation and programming
The 1F78-151 goes in without a C wire: we set it for one heating and one cooling stage, then program the weekday and weekend schedules with you. Since its sheet specifies 24 V, we confirm at the free in-home estimate that your equipment runs on 24 V.
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 1F78-151
Four things to know, then its ID card in twelve answers. “—” means the manufacturer does not publish it.
Is the EMERSON Classic 70 Series 1F78-151 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 1F78-151 before you buy
Raise the setpoint, change the mode: see how it responds.
How much good programming can save you
Set up your typical week. The math follows the rule published by Natural Resources Canada.
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. A programmable thermostat does the work for you.
The EMERSON Classic 70 Series 1F78-151 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 1F78-151 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 1F78-151
Short answers, no detours.
What does the EMERSON Classic 70 Series 1F78-151 work with?
According to the manufacturer’s sheet: fuel-fired or electric heat; 24 V.
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.