Digital Thermostat
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 Braeburn 1000NC Digital Non Programmable Thermostat by Braeburn $20.00 Time Remaining: 59m |
 T701 Pro1 IAQ Single Stage Non Programmable Thermostat $30.00 Time Remaining: 26d 20h 26m Buy It Now for only: $30.00 |
 ProSelect N P 1H 1C Thermostat $8.99 Time Remaining: 1h 20m Buy It Now for only: $14.99 |
 Bionaire Twin Window Fan with Remote Control Digital Thermostat NIB $58.99 Time Remaining: 16d 22h 17m Buy It Now for only: $58.99 |
 Aprilaire 8448 Digital Non Programmable Universal 2 Heat 1 Cool Thermostat $25.00 Time Remaining: 3h 4m Buy It Now for only: $30.00 |
 Hunter Digital Non Programmable Thermostat 42999B $0.99 Time Remaining: 5h 21m |
 NEW Honeywell TH6110D1005 Programmable 5 1 1 Digital Thermostat Focus Pro 6000 $53.99 Time Remaining: 15d 20h 13m Buy It Now for only: $53.99 |
 Honeywell FocusPRO 6000 Digital Thermostat 5 1 1 Programmable TH6220D1028 $13.49 (11 Bids) Time Remaining: 5h 25m |
 Robertshaw Thermostat 9420 $28.99 Time Remaining: 8d 21h 24m Buy It Now for only: $28.99 |
 to USA Digital temperature controller with probe Themostats 1100W $9.99 Time Remaining: 11h 42m |
 A C Thermostat programmable digital honeywell TH6110D1005 $19.99 Time Remaining: 15h 37m Buy It Now for only: $22.99 |
 NEW Honeywell Focus Pro 5000 Non Programmable Digital Thermostat TH5220D1003 $49.99 Time Remaining: 19d 19h 19m Buy It Now for only: $49.99 |
 Friedrich RT6 Digital Remote Thermostat Wall Mounted $9.99 (1 Bid) Time Remaining: 17h 41m |
 Robertshaw Digital Thermostat 300 201 NEW $55.00 Time Remaining: 7d 9h 22m Buy It Now for only: $55.00 |
 White Rodgers Type 1F86 244 Non Programmable Digital Thermostat $12.99 Time Remaining: 18h 57m |
 Venstar Wireless Digital Thermostat $15.00 Time Remaining: 21h |
 Honeywell Digital Non Programmable Thermostat for Electric Baseboard Heating $22.99 Time Remaining: 28d 21h 45m Buy It Now for only: $22.99 |
 Robert Shaw RS9500 Digital NON Programmable Thermostat New in Box RS 9500 $21.95 Time Remaining: 21h 31m Buy It Now for only: $24.95 |
 Bionaire Twin Window Fan Digital Thermostat 3 Speed with Remote Model BWF0910AR $39.99 Time Remaining: 4d 14h 27m Buy It Now for only: $39.99 |
 A C HONEYWELL PROGRAMMABLE 5 2 DAY DIGITAL WALL THERMOSTAT RTH6350D $30.00 Time Remaining: 21h 33m Buy It Now for only: $42.99 |
 EMERSON COMMERCIAL DIGITAL PROGRAMMABLE THERMOSTAT 75 1 1 DAY 1F95 0680 BNIB $49.95 Time Remaining: 21h 50m |
 Honeywell Digital Round Manual Thermostat Model CT8775A NEW $29.99 Time Remaining: 28d 19h 16m Buy It Now for only: $29.99 |
 WHITE RODGERS 80 SERIES DIGITAL WIRELESS THERMOSTAT MODEL 1F85RF 285 $175.00 Time Remaining: 22h 19m Buy It Now for only: $195.00 |
 Honeywell Digital Manual Thermostat for Heat Pump RTH3100C NEW $18.99 Time Remaining: 6d 18h 21m Buy It Now for only: $18.99 |
 digital non programmable thermostat $39.99 Time Remaining: 22h 31m Buy It Now for only: $50.00 |
 Honeywell TH5110D1022 Focus Pro 5000 Digital Thermostats $9.99 (1 Bid) Time Remaining: 23h 41m |
 ROBERTSHAW 5 2 DAY DIGITAL PROGRAMMABLE THERMOSTAT NEW $16.00 Time Remaining: 4d 18h 50m Buy It Now for only: $16.00 |
 Braeburn 3200 2 Heat 2 Cool Digital Thermostat $25.00 Time Remaining: 1d 2h 22m Buy It Now for only: $28.00 |
 BRAEBURN 1000NC DIGITAL NON PROGRAMMABLE THERMOSTAT $26.95 Time Remaining: 21d 14h 3m Buy It Now for only: $26.95 |
 Digital Non Programmable Thermostat Made by LuxPro $9.99 Time Remaining: 1d 11h 53m Buy It Now for only: $12.99 |
 ES230 R 240 208 Volt Digital Thermostat $18.00 Time Remaining: 1d 12h 54m |
 Dayton 1UHG1 Digital LCD Heat Thermostat 75 retail 240V In Line Voltage $14.99 Time Remaining: 4d 19h 33m Buy It Now for only: $14.99 |
 Luxpro PSP511LC programmable thermostat digital $18.99 Time Remaining: 2d 40m Buy It Now for only: $24.99 |
 Bionaire Twin Window Fan BWF0910AR w Remote Control Digital Thermostat $67.95 Time Remaining: 21d 16h 34m Buy It Now for only: $67.95 |
 NEW BRAEBURN 3200 2 HEAT 2 COOL THERMOSTAT NICE LOOK $19.99 Time Remaining: 2d 2h 38m |
 PSD111 LuxPro Digital Non Programmable Thermostat Single Stage Heat and Cool $19.99 Time Remaining: 2d 3h 22m |
 BIONAIRE TWIN 3 SPEED WINDOW FAN WITH DIGITAL THERMOSTAT REMOTE BWF0910AR NEW $62.95 Time Remaining: 18d 21h 15m Buy It Now for only: $62.95 |
 Robert Shaw 300 205 Digital Thermostat New in Box $12.95 Time Remaining: 2d 13h 21m Buy It Now for only: $14.95 |
 Hunter 42999 Digital NonProgrammable $20.50 Time Remaining: 15d 13h 50m Buy It Now for only: $20.50 |
 White Rodgers 80 Series 1F83 261 Digital $25.00 Time Remaining: 2d 14h 8m Buy It Now for only: $30.00 |
 HONEYWELL PROGRAMABLE DIGITAL THERMOSTADTS SET OF 2 $44.95 Time Remaining: 2d 16h 59m Buy It Now for only: $75.00 |
 Honeywell RTH2410B Digital Programmable ThermostatStat 5 1 1 DAY $18.99 Time Remaining: 21d 15h 39m Buy It Now for only: $18.99 |
 Trane TCONT402AN32DAA Digital Thermostat $20.00 (1 Bid) Time Remaining: 2d 20h 55m |
 30Off 110VAC Digital temperature controller + Probe Cooling Heating STC 1000 $19.99 Time Remaining: 10h 28m Buy It Now for only: $19.99 |
 Blue Single Non Programable White RodgersEmerson A c Thermostat $20.00 Time Remaining: 2d 22h 5m Buy It Now for only: $25.00 |
 honeywell thermostat th5220d1003 used digital hvac heat pump furnace $5.00 (1 Bid) Time Remaining: 3d 31m |
 ROBERTSHAW 9400 24 VOLT DIGITAL NON PROGRAMMABLE THERMOSTAT 47317 $21.00 Time Remaining: 10d 17h 5m Buy It Now for only: $21.00 |
 Programmable Thermostat Braeburn Model 5200 Digital $25.00 Time Remaining: 3d 3h 21m |
 HUNTER DIGITAL NON PROGRAMMABLE THERMOSTAT $9.99 Time Remaining: 26d 16h 16m Buy It Now for only: $9.99 |
 Honeywell CT3451A Digital Thermostat 5 1 1 Programmable $5.00 Time Remaining: 3d 14h 43m Buy It Now for only: $25.00 |
 Heat Pump Programmable Digital Thermostat NIB $39.99 Time Remaining: 3d 15h 35m Buy It Now for only: $49.99 |
 220V Electronic Universal Thermostat Temperature Controller Digital LCD Display $19.39 Time Remaining: 28d 11h 57m Buy It Now for only: $19.39 |
 Heat Pump Programmable Digital Thermostat NIB $39.99 Time Remaining: 3d 15h 36m Buy It Now for only: $49.99 |
 Lux Everything 2H 2C Digital Thermostat PSP722E $70.89 Time Remaining: 17d 3h 8m Buy It Now for only: $70.89 |
 DIGITAL HONEYWELL THERMOSTAT NON PROGRAMMABLE $25.99 Time Remaining: 3d 20h 6m Buy It Now for only: $29.99 |
 Robertshaw 9420 Digital Thermostat $14.99 Time Remaining: 3d 20h 42m |
 Digital Programmable underfloor heating Thermostat room temperature controller $32.98 Time Remaining: 28d 7h 55m Buy It Now for only: $32.98 |
 digital thermostat $7.99 Time Remaining: 3d 21h 16m |
 NEW HONEYWELL RTH111B HEAT COOLING DIGITAL THERMOSTAT $17.89 Time Remaining: 17d 18h 56m Buy It Now for only: $17.89 |
 Honeywell Model RTH230B AC Heating digital thermostat with filter change Icon $20.00 Time Remaining: 3d 22h 35m |
 NEW Wireless Digital Thermostat Kit with 2 Fan Speeds $0.99 (1 Bid) Time Remaining: 3d 23h 23m |
 NEW Digital Heat cool Thermostat Honeywell Ea Standard Thermostats $41.93 Time Remaining: 29d 7h 4m Buy It Now for only: $41.93 |
 Honeywell Pro 1000 1 Heat 1 Cool Non Programmable Thermostat $5.50 (4 Bids) Time Remaining: 4d 18m |
 30Off 110V Digital temperature controller with Sensor Cooling Heating STC 1000 $19.99 Time Remaining: 15d 5h 16m Buy It Now for only: $19.99 |
 HONEYWELL PRO 6000 DIGITAL PROGRAMMABLE THERMOSTAT TH6220D1028 $1.04 (2 Bids) Time Remaining: 4d 48m |
 110V 220V Digital temperature controller with Sensor Themostats 1100W $9.99 Time Remaining: 4d 1h 54m |
 Honeywell Digital Non Programmable Thermostat $17.99 Time Remaining: 5d 13h 57m Buy It Now for only: $17.99 |
 Brand New Unopened Honeywell T8775C Thermostat $0.01 Time Remaining: 4d 2h 54m |
 BRAEBURN 1005NC DIGITAL NON PROGRAMMABLE HEAT ONLY COOL ONLY THERMOSTAT $26.95 Time Remaining: 26d 18h 52m Buy It Now for only: $26.95 |
 White Rodgers1F80 361 Digital 5 1 1 Day Programmable Thermostat $55.00 Time Remaining: 4d 4h 7m |
 NEW Honeywell 52 Day Digital Programmable Thermostat RTH6350D Backlit Display $35.00 Time Remaining: 4d 6h 45m Buy It Now for only: $40.00 |
 Honeywell FocusPRO 5000 Digital Thermostat TH5110D1006 $22.00 Time Remaining: 6d 9h 50m Buy It Now for only: $22.00 |
 Honeywell 5 1 1 Day Programmable Digital Thermostat for Heating Cooling Systems $9.99 (1 Bid) Time Remaining: 4d 13h 51m |
 BRAEBURN 2000 DIGITAL 5 2 DAY PROGRAMMABLE THERMOSTAT $40.95 Time Remaining: 28d 17h 39m Buy It Now for only: $40.95 |
 Honeywell 7 Day Programmable Digital Thermostat for Heating Cooling Systems $9.99 (1 Bid) Time Remaining: 4d 13h 53m |
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Maverick Wireless BBQ Thermometer Set - Maverick ET732
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DescriptionMaverick Wireless BBQ Thermometer Set - Maverick ET732 |
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Taylor 9842 Commercial Waterproof Digital Thermometer
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DescriptionFlat-Edged Dial Safe-T-Guard Thermometer with Antimicrobial Sleeve. Special additive in the sleeve material inhibits bacterial and fungal growth. Thermometer is waterproof for dependable use in kitchen or lab environments... |
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Taylor 1470 Digital Cooking Thermometer/Timer
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DescriptionOpening the oven to check on a food's temperature means wasting the cook's time and losing oven temperature and moisture--not to mention a face full of steam. This thermometer prevents those problems. Insert the instrument's 6-inch stainless-steel probe into a roast beef or turkey and monitor the time and temperature (from 32 to 392 degrees F) on the thermometer's large digital display, which connects to the probe with a 4-foot cord... |
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Bionaire BW2300 Twin Window Fan with Remote Control
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DescriptionWith a remote control for convenient adjustment, this double window fan draws in fresh, cool air from the outside or exhausts stale, hot air from inside. It can also do both simultaneously, because each of the two fans can be set independently to draw in or exhaust out, allowing the unit to exchange inside and outside air... |
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- Frigidaire FRA086AT7 8,000 BTU Window-Mounted Compact Air Conditioner with Temperature Sensing Remote
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Description8000 BTU cooling capacity with variable speed fan Cools room sizes up to 350 sq. ft. 8-way air direction control Anti-bacterial mesh filter type tilt-out filter access Electronic controls |
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Frigidaire FRA054XT7 5,000 BTU Window-Mounted Mini Room Air Conditioner
Sale Price: $156.94 |
DescriptionFrigidaire's FRA054XT7 Energy Star 5,000 BTU 115-Volt Window-Mounted Mini-Compact Air Conditioner is perfect for rooms up to 165 sq ft. It quickly cools the room on hot days and quiet operation keeps you cool without keeping you awake... |
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Sunbeam Health at Home 756-500 Standard Heating Pad with NEW Arthritic Controller
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DescriptionUltraHeat technology provides quick, consistent heat for fast relief and comfort. Ultra fast, even heat. Extra large, easy slide controller. 3 heat settings. machine washable cover. 7' long power cord... |
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Sunbeam Health at Home Heating Pad, King Size 14" x 18"
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DescriptionHeatSense technology self-regulates to eliminate hot spots High tech ergonomically designed controller 6 heat settings Selectable auto-off (choose between 2 hourauto-off or continuous ON) Extra soft plus size integrated pad (14 x 18) conforms to body and is machine-washable Integrated elastic loops offer convenient cord/pad storage Moist heat option for deep penetrating pain relief Vinyl storage bag 12 footextra long cord Lifetime Warranty |
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TEMPer USB Thermometer w/ Alerts
Sale Price: $24.99 |
DescriptionMonitor the temperature with a USB thermometer. The included software takes temperature readings, records them, and graphs them. Set temperature for Fahrenheit or Celsius, and adjust the intervals at which temperature is read... |
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Fieldpiece HS36 Expandable Autoranging True RMS Stick Multimeter w/Backlight
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DescriptionOur top of the line True RMS Stick Meter, the HS36 includes the ranges you use everyday for HVAC/R field service plus includes a bright blue backlight and True RMS. Like the rest of the HS30 series, the HS36 comes equipped with a magnetic hanger, along with detachable silicone test leads and alligator clip probe tips for remote and easy one-handed testing, as well as the full set of built-in safety features... |
Advantages of digital thermostat
An important advantage of the digital thermostat is the simplificity with which the temperature and time settings are stored and retrieved. A minimum number of keys are used, together with a "slew entry" type of system in which the keys are held untilthe desired time or temperature setting is displayed. The keys or switches must be held for a certain predetermined time, such as six seconds, before any alteration of the contents of the registers are effected. As a result, an accidental contacting ofthe keys will not result in accidental alteration of stored time and temperature settings.
Another important advantage is that microcomputer 57 automatically sorts the time settings within the registers H1 through H4. The user may enter times and temperatures in any order, and need not place the earliest time in register H1. This isan important advantage, particularly where the user wishes to add an additional time and temperature (where at least one of the registers had not been previously used), or wishes to alter the time and/or temperature setting stored in one of theregisters. Unlike prior art digital clock thermostats, the thermostat of the present invention does not require that the user reprogram all of the temperature and time settings in order to place the times and temperatures in sequential order. Rather,microcomputer 57 automatically sorts the times within registers H1-H4 to place them in sequential order for use in controlling the heating system.
In normal operation, microcomputer 57 causes display 16 to display room temperature, as sensed by thermistor 94. On a periodic basis, which in one preferred embodiment is every minute, microcomputer 57 performs an "update" routine in which itdetermines whether the furnace should be turned on or off, and whether the air conditioning should be turned on or off. Unlike prior art digital thermostats, the preferred embodiment of the present invention automatically decides whether to turn on heator air conditioning, and does not require the user to select heating only or air conditioning only.
When microcomputer 57 begins the update routine, it first determines the room temperature from the room temperature register, and then determines the time of day from the time-of-day register. Microcomputer 57 then compares the time of day fromthe time-of-day register with the times stored in registers H1, H2, H3 and H4, in order to determine which of the four registers is applicable.
After the proper heat register (H1-H4) has been selected, microcomputer 57 compares the sensed room temperature with the control temperature in the selected heat register. Depending upon this comparison, microcomputer 57 may provide a signal tocontrol circuit 82 to (a) turn on the furnace if it is presently off; (b) turn off the furnace if it is presently on; (c) leave the furnace on; or (d) leave the furnace off. If the furnace is to be turned on, turned off, or left on, microcomputer 57takes the appropriate action and discontinues the update routine. If, however, the furnace was already off and the decision was made that it should remain off, microcomputer 57 then checks the contents of the AO and AC registers to determine whether airconditioning is appropriate.
If the content of the AO register is "OF", no air conditioning is permitted and microcomputer 57 discontinues the "update" routine. If, on the other hand, the content of the AO register is a number between "00" and "23", microcomputer 57 thenchecks the time stored in the AC register against the time of day. If this comparison indicates that air conditioning should be on, microcomputer 57 then compares the room temperature to the control temperature stored in register AC and provides theappropriate signal to control circuit 94 to control the air conditioning system. Microcomputer 57 may (e) turn air conditioning on, (f) turn air conditioning off, (g) leave air conditioning on, or (h) leave air conditioning off.
If the time of day does not fall within a time period in which the air conditioning is to be operating, as indicated by the times stored in the AO and AC registers, microcomputer 57 normally will not turn on the air conditioning. If, however,the room temperature exceeds a predetermined level, such as 85° F., and the AO and AC registers indicate that air conditioning is desired during some hours of the day, then microcomputer 57 will provide signals to control circuit 94 in order tooperate the air conditioning system to maintain room temperature at 85° F. In this way, room temperature is not permitted to rise to such a high level that the air conditioning would be unable to effectively reduce the room temperature to thedesired control temperature during the time period when air conditioning is desired.
The digital thermostat of the present invention also prevents undue switching back and forth between heating and air conditioning by giving first priority to heating. Microcomputer 57 always checks the contents of registers H1-H4 first, and controls thefurnace before any determination of the need for air conditioning is made. In addition, the need for air conditioning is checked by microcomputer 57 only if the furnace is already off and the decision (by comparing the room temperature with the controltemperature in one of the heat registers (H1-H4) is that the furnace should remain off. As a result, a time delay of at least one minute (the period between successive "update" routines) occurs between the turning off of the furnace and the turning onof the air conditioner. If microcomputer 57 turns off the furnace during one update routine, it must wait until the next update routine before it can determine the need for air conditioning.
The thermostat of the present invention, therefore, provides automatic control of both heating and air conditioning and an automatic switch-over between heating and air conditioning without requiring the user to change the position of a switch. This is particularly advantageous in climates where there is a wide variation between daytime and nighttime outdoor temperatures. In these climates, it is often necessary to provide air conditioning during the day and heating during the night.
In addition, the information stored in registers H1-H4 is independent of the information stored in registers AO and AC. The programming of heat control information in registers H1-H4 is independent of and does not affect the information inregisters AO and AC, and vice versa. When the thermostat automatically switches between heating and air conditioning, the contents of regisers H1-H4, AO and AC remain intact. This is unlike the prior art digital thermostats in which switching betweenheating and air conditioning requires reprogramming and/or results in a loss of the time/temperature program for either heating or air conditioning.
In conclusion, the present invention is an easy-to-use, low cost, digital clock thermostat. Although the present invention has been described with reference to preferred embodiments, workers skilled in the art will recognize that changes may bemade in form and detail without departing from the spirit and scope of the invention.
About the Author
An important advantage of the digital thermostat is the simplificity with which the temperature and time settings are stored and retrieved. A minimum number of keys are used, together with a "slew entry" type of system in which the keys are held untilthe desired time or temperature setting is displayed.