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Lennox 51M33 Comfortsense 3000, L3021H Non-Programmable Thermostat, Multi-Stage, Heat Pump

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Digital Non-Programmable Thermostat

Simple and efficient temperature control

2H/1C - Heat Pump or Dual Fuel, Large, back−lit LCD Screen

Conventional Heat/Cool and Heat Pump System Models

Manual Changeover

  • Simple up and down arrows for intuitive temperature adjustments
  • Intuitive, advanced electronics provide equipment protection timers and filter and service reminders
  • Easy-to-read digital interface that displays operational status
  • Stylish design to complement any interior setting


Brand Lennox
Catalog Number 51M33
Model/Part Number L3021H
Minimum Order Quantity 0.0
Base Unit of Measure Unit(S)
EAN / UPC 66255138108
Product Depth 1.375 IN
Product Height 3.5 IN
Product Width 4.5 IN
Type Heat Pump
Gross Weight 0.75 LB
Family ComfortSense 3000
Hertz 60 hz
Changeover Auto
Humidification Control No
Lennox Brand Comparison 51M33
Program Type Non-Program
Communicates with Lennox No
Stages Quantity 2 Heat/1 Cool
Intelligent Recovery No
WiFi Remote Access No

Free Shipping Next Business Day

Customer Reviews

Based on 1 review
Steven Schell
Everything fine from start to finish

Atomic filters was a breeze to deal with and the Lennox thermostat fit seamlessly replacing the 10+ year old one we already had