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Air Distribution & IAQ
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Air Distribution & IAQ (2216)
Heating/AC Equipment (1432)
HVACR Parts (6632)
HVACR Supplies (2118)
Hydronics (861)
Refrigeration (1787)
Thermostats (340)
Tools & Instruments (1092)
A2L Compatible Tools (119)

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Amana (1)
Braeburn Systems (4)
Daikin North America LLC (6)
Emerson Electric (15)
Goodman Manufacturing (1)
Honeywell (15)
Pro1iaq (3)
REHAU (1)
Research Products Corporation (4)
Resideo Honeywell Home (8)
White Rodgers (1)

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70 Series™ (2)
700 Family (1)
80 (1)
80 Series (2)
8900 Series (1)
Blue™ (5)
Blue™ Commercial (2)
Blue™ Easy Reader™ (1)
Builder (1)
CommercialPRO™ 7000, TB7220 (1)
FocusPRO® (4)
Home Comfort Control™ (1)
MultiPRO™ 7000 (1)
PRO® 2000 (1)
PRO® 6000 (1)
Premier (1)
Premium Series (1)
Prestige® IAQ (3)
Prestige®, YTHX9421R (1)
TH9320 (1)
THX9421R (1)
VisionPro 8000 (4)
ZonePRO® (1)

13 More

Plastic (2)

7-Day Programmable, 5-1-1 Programmable, 5-2 Programmable, 1 Week (5)

Arctic White (4)
Black (2)
Off-White (1)
Premier White (12)
White (20)
White, matte finish (2)

24 Vac heat + cool systems. Gas, Oil, Electric, or Steam/Radiant hot water Systems. Heat pumps without Auxiliary Heat (5)
Conventional (8)
Conventional or Heat Pump (28)
Heat Pump / Multi-Stage (Heat/Cool) (2)
Single stage/heat pump/multi-stage (1)
Universal (2)

Aprilaire® (3)
Braeburn (2)
ComfortNet™ (2)
Daikin® (3)
Emerson (1)
Honeywell (14)
Prestige® (1)
Pro1iaq (1)
REHAU (1)
White-Rodgers™ (12)

1 (7)
2 (2)
3 (10)
3 Heat Pump, 2 Conventional (3)
4 (9)
4 Heat Pump, 3 Conventional (2)

Amana (1)
Braeburn Systems (2)
Daikin Company, L.P. (2)
Emerson Electric (13)
Goodman (1)
Honeywell (15)
Pro1iaq (2)
REHAU (1)
Research Products Corporation (3)
Resideo Honeywell Home (8)

2-Wire, Touchscreen (2)
Digital Thermostat (1)
Digital, Low Voltage (18)
Digital, Low Voltage, Touchscreen (1)
Digital, Standard (1)
Heat-Cool (1)
Internet enabled, WiFi (1)
Low Voltage (7)
Multi-Purpose (1)
Multi-Stage, Universal (5)
Single Output, VAV (1)
Touchscreen (1)
Wireless (6)
Wireless Wi-Fi (1)

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0/30 VAC, 50/60 Hz (1)
18 - 30 VAC, 3 VDC (1)
18 to 30 Vac (1)
18/30 V (1)
18/30 VAC (2)
18/30 VAC, 50/60 Hz (6)
20 - 30 VAC (1)
20/30 V (1)
20/30 VAC (2)
20/30 VAC, 50/60 Hz (2)
24 V (2)
24 VAC (16)
24 VAC (3VA minimum) (1)
24 VAC, 50/60 Hz (1)
30 VAC (2)

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Temperature Settings Per Day

1 (1)
2, 0 (1)
4 (16)
4 or 2 (2)
4, 2, 0 (6)
7 (2)

Energy Star Rating

Yes, Certified (2)

32 - 120 deg F (4)
32 - 90 deg F Heat, 50 - 99 deg F Cool (4)
40 - 90 deg F Heat, 50 - 99 deg F Cool (10)
40 - 99 deg F (4)
41 - 99 deg F (1)
44°F to 90°F (7°C to 32°C) (2)
45 - 90 deg F (8)
45 - 99 deg F (10)
50 - 90 deg F (1)
50 - 95 deg F (1)
Heat: 35 to 99 °F Cool: 35 to 99 °F (1)

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Number of Stages

1 Heat/1 Cool (9)
1H/1C (1)
2 Heat/1 Cool (2)
2 Heat/2 Cool (1)
2H/2C Conventional, 3H/2C Heat Pump (3)
3 Heat/2 Cool (12)
3 Heat/2 Cool Heat Pump, 2 Heat/2 Cool Conventional Systems (3)
3H/2C Conventional, 4H/2C Heat Pump (2)
3H/3C conventional and 4H/2C heat pump (1)
4 Heat/2 Cool (9)
4H/2C (1)

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1 Inch L x 2-5/8 Inch W x 4-9/16 Inch H (1)
1 Inch L x 5 Inch W x 4-1/2 Inch H (1)
1-1/8 Inch L x 4-15/16 Inch W x 4-5/8 Inch H (1)
1-3/8 Inch L x 6 Inch W x 3-3/4 Inch H (1)
3-1/2 Inch H x 4-1/2 Inch W x 7/8 Inch D (3)
3-1/2 Inch L x 4-1/2 Inch W x 7/8 Inch D (1)
3-1/4 Inch H x 3-1/4 Inch W x 1 Inch D (1)
3-3/4 Inch H x 6 inch W x 1-1/8 Inch D (2)
3-3/4 Inch L x 6 Inch W x 1-1/4 Inch D (1)
3-3/4 Inch L x 6 Inch W x 1-3/8 Inch D (1)
3-9/16 Inch L x 5-13/16 Inch W x 1-1/2 Inch D (1)
3.44 Inch H x 5.13 Inch W x 1.188 Inch D (4)
3.62 Inch L X 4.72 Inch W X 1.38 Inch H (1)
3.75 Inch L x 5.1 W x 1.1 D (1)
3.8 Inch L x 6.1 Inch W x 1.1 Inch D (1)
3.86 Inch L x 5.11 Inch W x 1.42 Inch H (1)
3.86” x 5.11” x 1.42” (2)
4-11/16 Inch L x 2-7/8 Inch W x 1-1/8 Inch D (1)
4-5/8 Inch L x 4-15/16 Inch W x 1-1/8 Inch D (3)
4.2 Inch L x 6.4 Inch W x 1.7 Inch D (2)
4.6 Inch L x 5.9 Inch W x 1.2 Inch D (4)
4.7"W x 4.4"H x 1.1"D (1)
4.7”W x 4.4”H x 1.1”D (1)
5-1/4 Inch L x 4-1/2 Inch W x 1 Inch D (1)
5.3 Inch L x 3.25 Inch W x 1.1 Inch D (1)
6.4 Inch L x 4.2 Inch W x 1.7 Inch D (1)
7.1 Inch L x 4.4 Inch W x 1.9 Inch D (1)
7/8 Inch L x 4-1/2 Inch W x 3-1/2 Inch H (2)

18 More

+/-1 deg F (14)
0.2 deg F (1)
0.2°F to 2.0°F (1)
0.5 - 1.9 deg F (2)
0.5 - 2 deg F 1st Stage, 2 - 6 deg F 2nd Stage (2)
0.6 - 1.2 deg F (6)
0.6 - 1.6 deg F (2)
0.6 - 1.9 deg F (2)
0.6 deg F Heat, 1.2 deg F Cool (2)

Terminal Designations

C, R, Rc, Rh, W-O/B, W2-Aux/E, Y, Y2, G, L, RAS (5)
G, Rc, Rh, W2, O/B, Y1, Y2, W1/E/W3, C, L, S1, S2 (1)
R, C (1)
R, RC, C, W (O/B), W2 (AUX/E), Y, Y2, G, L, K (1)
R, RC, C, W, Y, G, O, B (1)
R, RC, C, W-O/B, W2-AUX/E, Y, Y2, G, A-L/A, K, U1 U1, S1 S1 (1)
R, RC, C, W-O/B, W2-Aux/E, Y, Y2, G, A-L/A, K, S1 S1 (1)
R, RC, C, W-O/B, W2-Aux/E, Y, Y2, G, A-L/A, K, U1 , S1 (1)
R, RC, C, W-O/B, Y, G, K, S1 S1 (1)
R, Rc, W, W2, Y, Y2, A, G, C, S1, S2 (1)
R, Rc, W1, O/B, Y, G, G2, G3, C, S1, S2 (1)
RC, RH, C, W/E, W2, Y, Y2, G, O/B, 6, L, A1, + S – (1)
RC, RH, C, W/E, W2, Y, Y2, O/B/6, G, L (1)
RC,RH,C,W/E,W2,Y,Y2,O/B/6,G,L (1)
RH, RC, C, Y, W, G, O, B (1)
RH, RC, C, Y, W, G, O, B, 6, +, S, -, L (1)
RH, RC, C, Y, Y2, W/E, W2, G, O, B, L, 6, +, S- (1)
RH, RC, C, Y, Y2, W/E, W2, G, O/B, 6, L, A1, + S – (1)
RH, RC, C, Y, Y2, W/E, W2, G, O/B, L (1)
RH, RC, C, Y, Y2, W/E, W2, G, O/B, L, 6, +, S, - (1)
RH, RC, C, Y1, Y2, W/E, W2, G, O/B, L, +, S, -, 6, HM, DHM (1)
RH, RC, Y, W, G, O, B (2)
Rc, R, W, Y, G, C, S1, S2, 0/B, L, W2, Y2 (1)
Rc, Rh, O, B, Y1, W1, G, C (1)
Rc, Y1, W1/O/B, Acc+, Rh, Y2, W2, Acc-, G, C (1)
Rh, C, Rc, W, O, B, Y, G (1)
S1, S2, P1, P2, L, C, Y2, Y1, O/B/V3, W2/AUX, W1/E, Rh, Rc, G (2)

17 More

Suitable For Use With

Standard systems gas, oil, electric (1)
Universal (1)

Battery (6)
Battery/Hardwired (10)
Battery/Hardwired/Power Stealing (2)
Hardwired (6)
Hardwired/Battery (14)
Hardwired/Battery/Power Stealing (3)

1 (9)
2 (19)
2 Heat Pump, 2 Conventional (5)

Auto-On (21)
Auto-On, Fan Coil, Hi-Med-Low, PTAC, Hi-Low (1)
Auto-On-Circulate (1)
Auto-On-Circulate-Follow Schedule (5)
Auto-On-Off-Circulate (2)
Auto-On-Program (2)
Auto-On-Program-Circulate (5)

Compatible With

Dual fuel systems (3)

10 sq-Inch (1)
41°F to 95°F (5°C to 35°C) (1)
8.06 sq-Inch (2)
Backlit (9)
Backlit LCD (3)
Backlit, Touchscreen (3)
Color LCD (1)
Color Touchscreen (1)
Digital (7)
High Definition Digital (1)
High Definition Digital, Touchscreen (2)
LCD (8)
LCD, 4.84 sq. in. (4)
LCD, 8 sq. in. (1)

4 More

Horizontal (33)
Horizontal/Vertical (3)
Mounts on wall or junction box (1)
Vertical (3)

System Switching

Auto-Heat-Cool-Emer-Off (2)
Auto-Heat-Cool-Off (5)
Auto-Heat-Cool-Off-Emergency (10)
Auto/Manual (2)
Electric or Gas configurable (1)
Heat-Cool-Off (5)
Heat-Cool-Off-Emergency (3)
Heat-Off-Cool Auto Emergency Heat (3)
Heat-Off-Cool-Auto (3)
Heat-Off-Cool-Auto-Em Heat (3)

Programs Per Week

5-1-1 (6)
5-1-1, 5-2 (1)
5-1-1, 7 (2)
5-1-1/5-2 (3)
5-2 (3)
7 (17)
7 Day or 5/1/1 Programmable (1)
7 Day, 5+1+1 Day or Off (2)

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Picture of T855 Pro1 Programmable Thermostat 3H/2C Heat Pump + 2H/2C

T855 Pro1 Programmable Thermostat 3H/2C Heat Pump + 2H/2C

SKU: 88284

T855 Pro1 Programmable Thermostat 3H/2C Heat Pump + 2H/2C Conventional

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