EMERSON 80 Series 1F83H-21PR Thermostat | Montreal, Laval, Longueuil, South Shore & North Shore
A central heat pump backed up by a gas furnace or electric heat: 7-day or 5-1-1 schedule, a dual-fuel logic option and adjustable differentials.
Quick facts
In many homes, the central heat pump carries most of the winter and a gas furnace or electric backup takes over in the deep cold. The 80 Series 1F83H-21PR (EMERSON’s White-Rodgers line) is a programmable heat pump thermostat: it runs the compressor and the backup stage, and its instructions cover dual fuel with the dual-fuel logic option.
Built for a heat pump and its backup
- Stages: 2 heat / 1 cool, meaning a single-stage compressor plus one stage of electric or gas backup.
- Heat pumps: air-source or geothermal.
- Dual fuel: heat pump and gas furnace, with the dual-fuel logic option.
- Adjustable differentials: 0.9 / 1.2 / 1.7 °F for the heat pump and 0.5 / 0.75 / 1.9 °F for the backup (fast, medium or slow).
- Schedule: 7-day, 5-1-1 (the default) or non-programmable, 4 periods per day.
- Power: batteries or hardwired at 20 to 30 VAC; maximum load of 1.5 A per terminal and 2.5 A total.
Where it fits, and where it does not
It is designed for a central heat pump, with electric backup or a gas furnace as the second source. A furnace on its own needs a conventional thermostat, and it is not meant for hot water or steam systems, baseboards, convectors, radiant ceilings, fan-forced heaters, electric floor heating or wall or ducted heat pumps. In its 2025 cross-reference table, the brand lists the 1F83H-21PR to replace the 1F82-261 and 1F82-0261.
Close relatives
The EMERSON 80 Series 1F83H-21NP runs the same heat pump with the same dual-fuel option, minus the schedule. The EMERSON 70 Series 1F75H-21PR is programmable too, with the same stages and the same maximum load; it has no L terminal, and its sheet lists 2 AA batteries and continuous backlight as an option with a C wire.
Wiring and setup by AirGreen
The technician connects terminals R, C, Y, O/B, G, W2, E and L to match your equipment, chooses battery or hardwired power, then turns on the dual-fuel logic option when a gas furnace is the backup. Next come the heat pump and backup differentials, then your schedule. The free in-home estimate confirms the type of backup before installation.
Manufacturer document: 1F83H-21PR installation instructions (37-7511). Sold and installed by AirGreen. We serve Montréal, Laval, Longueuil, the North Shore and the South Shore.
Key facts: EMERSON 80 Series 1F83H-21PR
Four things to know, then its ID card in twelve answers. “—” means the manufacturer does not publish it.
Is the EMERSON 80 Series 1F83H-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 80 Series 1F83H-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 80 Series 1F83H-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 80 Series 1F83H-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 80 Series 1F83H-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 80 Series 1F83H-21PR
Short answers, no detours.
What does the EMERSON 80 Series 1F83H-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.