EMERSON 70 Series 1F75H-21PR Thermostat | Montreal, Laval, Longueuil, South Shore & North Shore
A central heat pump backed by electric heat or a gas furnace, on a 7-day or 5-1-1 schedule: this thermostat runs both heating stages around your week.
Quick facts
In a home heated by a central heat pump, the thermostat does more than switch a unit on and off: it runs the compressor and a backup stage. The 1F75H-21PR (EMERSON’s White-Rodgers line) does that job on a schedule, which helps if your week alternates between the office and home.
A heat pump that keeps to your schedule
- 2 heat, 1 cool: a single-stage compressor plus one stage of electric or gas backup.
- Optional dual-fuel logic: built into the thermostat, for a heat pump paired with a gas furnace.
- Schedule: 7-day or 5-1-1 (default), 4 periods per day; non-programmable mode is still available.
- Adjustable differentials: fast, medium or slow, i.e. 0.9 / 1.2 / 1.7 °F for the heat pump and 0.5 / 0.75 / 1.9 °F for backup.
- Power: 2 AA batteries or hardwired at 20 to 30 VAC; continuous backlight on the large display is an option with a C wire.
- Temperature setting: 7 to 37 °C (45 to 99 °F).
Compatible heat pumps
It is built for air-source or geothermal central heat pumps with electric or gas backup, and for dual fuel (heat pump plus gas furnace), which its instructions cover with the dual-fuel logic option. Without a heat pump, a furnace calls for a conventional thermostat instead. It is not meant for hot water or steam systems, or for baseboards, convectors, fan-forced heaters, electric floor heating or wall or ducted heat pumps.
Compared with its neighbours
On the non-programmable side, the EMERSON 70 Series 1F75H-21NP keeps the same stages, dual-fuel logic and differentials, with no periods to set. The EMERSON 80 Series 1F83H-21PR has the same programming and dual fuel; on paper, the notable difference is an L terminal on top of the R, C, Y, O/B, G, W2 and E terminals of the 1F75H-21PR. In its 2025 cross-reference table, the brand lists the 1F75H-21PR to replace the EMERSON Classic 70 Series 1F72-151.
Set-up by AirGreen
During the free in-home estimate, we note whether your backup is electric or a gas furnace; if it is a gas furnace, we turn on the dual-fuel logic option. The thermostat is then set up for two heating stages and one cooling stage, powered by its AA batteries or hardwired if a C wire is there, and your schedule is entered before we leave.
Manufacturer document: 1F75H-21PR installation instructions (37-7843). Sold and installed by AirGreen. We serve Montréal, Laval, Longueuil, the North Shore and the South Shore.
Key facts: EMERSON 70 Series 1F75H-21PR
Four things to know, then its ID card in twelve answers. “—” means the manufacturer does not publish it.
Is the EMERSON 70 Series 1F75H-21PR 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 70 Series 1F75H-21PR 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 70 Series 1F75H-21PR 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.
Products that go with the EMERSON 70 Series 1F75H-21PR
Parts named in its spec sheet that we sell and install.
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 70 Series 1F75H-21PR 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 70 Series 1F75H-21PR
Short answers, no detours.
What does the EMERSON 70 Series 1F75H-21PR work with?
According to the manufacturer’s sheet: air-source or geothermal heat pump; dual fuel with the dual-fuel logic option.
Does it need a C wire?
Per the spec sheet, it can run on batteries; a common wire is still recommended when available.
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.
What is the warranty?
5 years, per the manufacturer’s information.
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.