Emerson 1F85U-42PR Programmable HVAC Control
Programmable HVAC thermostat with 7-day or 5-1-1 scheduling, backlit display and dual-fuel control for 240 V systems
- Rated voltage240 V
- Mounting styleWall Mount
- Relay contact1F85U-42PR (new model), 100240 V
- Certifications and standardsNot capable emitting RF energy
- Product typeProgrammable, Hand Control
- Size or dimensions6 in × 1.13 in × 3.75 in
- Easy reading in low light with large backlit display
- Flexible scheduling via 7-day or 5-1-1 day options
- Quick DIY setup using built-in level and pluggable terminals
- Secure control through keypad lockout and temperature limits
- Dual fuel operation without outdoor sensor required
Programmable HVAC thermostat for residential
The Emerson 1F85U-42PR is a wall-mounted programmable thermostat designed for 240 V residential heating and cooling systems. It supports selectable 7-day, 5-1-1-day or non-programmable operation with four daily periods. The unit is sold individually from a 12-pack carton and includes a built-in level indicator and pluggable terminals to simplify first-time installation.
Sustained scheduling and dual-fuel operation
The thermostat maintains programmed set-points continuously across extended heating or cooling seasons without drift. Its dual-fuel logic manages heat-pump and fossil-fuel stages automatically without requiring an outdoor temperature sensor. A filter-change reminder tracks runtime over months of operation, and keypad lockout prevents unauthorised adjustments during prolonged use.
White housing with backlit display and universal
The white plastic housing measures 6 in x 1.13 in x 3.75 in and features a large backlit display readable in low light. A universal back-plate accommodates existing wiring holes, while pluggable terminal blocks allow wires to be connected before the thermostat body is snapped into place. The device does not support line-voltage baseboard systems rated at 110 V or 220 V, nor proprietary communicating equipment.
How it compares
Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.
- Price $96.99
- Pricier than about 68% of the 1,762 comparable items (median $45.99).
Specifications
| Product | |
|---|---|
| Brand name | White-Rodgers, Copeland |
| Model name | 1F85U-42PR |
| Part number | 1F85U-42PR |
| Product type | Programmable, Hand Control |
| Product color | White |
| Power | |
| Rated voltage | 240 V |
| Size & build | |
| Size or dimensions | 6 in × 1.13 in × 3.75 in |
| Mounting style | Wall Mount |
| In the box | |
| Number of items | 12 pack |
| Environment & compliance | |
| Certifications and standards | Not capable emitting RF energy |
| More details | |
| Relay contact | 1F85U-42PR (new model), 100240 V |
Questions about this item
Does the 240 V programmable thermostat draw noticeable power or generate heat when running continuously?
It operates on standard 24 V control voltage and uses a 100240 V relay contact, so its own power draw and heat output are negligible during all-day operation.
What existing wiring and system components are required for the 1F85U-42PR to function?
You need a conventional 24 V HVAC system with C, R, W, Y, G terminals; it will not work with 110 V or 220 V line-voltage baseboard heat or proprietary communicating equipment.
Will the 1F85U-42PR control an older dual-fuel furnace and heat-pump combination without extra sensors?
Yes, dual-fuel control is built in and eliminates the need for an outdoor sensor, so it manages the changeover between the existing furnace and heat pump automatically.
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