If you have children, you’ve probably had to turn the thermostat down a notch after they set the temperature all the way up in winter. A lock box can put a stop to that and keep the temperature exactly where you set it.

To be sure that your thermostat is completely protected from unauthorized access, you want to get one with password protection features.

we’ve put together a collection of the best Thermostat Locks that are currently available on the market. To help you find the perfect Thermostat Lock among a wide variety of options, we constantly update our collection with new and trending models.

10 Best Thermostat Locks

Based on dozens of customer reviews and ratings, the followings are the top 10 best-selling Thermostat Locks:

# Preview Product Price
1 Honeywell Home CG511A1000 Medium Thermostat Guard Honeywell Home CG511A1000 Medium Thermostat Guard $15.45 View Product
2 Honeywell Home CG512A1009 Large Thermostat Guard Honeywell Home CG512A1009 Large Thermostat Guard $18.66 View Product
3 Honeywell Home CG510A Thermostat Guard, Small Honeywell Home CG510A Thermostat Guard, Small $15.99 View Product
4 StatGuardPlus Large Thermostat Cover with Changeable Code Combination. Locking Thermostat Cover Fits Most Sizes (1, Clear) SGP201401CL StatGuardPlus Large Thermostat Cover with Changeable Code Combination. Locking Thermostat Cover Fits… $28.00 View Product
5 TayMac ZTC100 Plastic Thermostat Cover Low Profile, Small, Clear TayMac ZTC100 Plastic Thermostat Cover Low Profile, Small, Clear $16.18 View Product
6 Lux A772001T-005 BB2001-005 Medium Locking Thermostat Lux A772001T-005 BB2001-005 Medium Locking Thermostat $21.99 View Product
7 Emerson G10 Universal Locking Thermostat Guard, Clear Emerson G10 Universal Locking Thermostat Guard, Clear $20.22 View Product
8 Supplying Demand BTG-UWM Metal Thermostat Guard Universal Compatibility Supplying Demand BTG-UWM Metal Thermostat Guard Universal Compatibility $26.99 View Product
9 BISupply AC Thermostat Cover with Lock, AC Thermostat Lock Box Cover Thermostat Guard with Lock, 7.7 x 3.3 x 4.75 Inch BISupply AC Thermostat Cover with Lock, AC Thermostat Lock Box Cover Thermostat Guard with Lock, 7.7… $25.99 View Product
10 Honeywell CG512A Large Thermostat Guard with Inner Shelf to Prevent Tampering (2) Honeywell CG512A Large Thermostat Guard with Inner Shelf to Prevent Tampering (2) $38.90 View Product

Top Rated Thermostat Lock Reviews

Since we’ve mentioned 10 different models of Thermostat Locks on the above list, it may be difficult for you to find the right one for your needs. This is why we listed the key features of each of these Thermostat Locks below:

Sale1

Honeywell Home CG511A1000 Medium Thermostat Guard
Honeywell Home CG511A1000 Medium Thermostat Guard

$15.45
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Product Highlights:

  • Protect again tampering, damage and unauthorized adjustment of thermostat settings.
  • Fits Honeywell Home thermostat families RTH8xxxx, RTH7xxxx, RTH6xxxx, RTH5xxxx, CT3x and other models measuring 6 1/16 W x 5 1/16 H x 2 5/8 D inches or smaller.
  • Actual size of thermostat guard: 6. 5″ H x 7. 5″ W x 3″ D.
  • Key lock with inner shelf to prevent tampering.
  • Clear plastic casing is chemical and UV resistant that resists yellowing.
Sale2

Honeywell Home CG512A1009 Large Thermostat Guard
Honeywell Home CG512A1009 Large Thermostat Guard

$18.66
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Product Highlights:

  • Protect again tampering, damage and unauthorized adjustment of thermostat settings.
  • Key lock with inner shelf to prevent tampering.
  • Clear plastic casing is chemical and UV resistant that resists yellowing.
  • Fits Honeywell Home thermostats listed as well as other models measuring 8. 25″W x 5. 75″L x 2. 75″D or smaller
  • Fits Honeywell Home models: RTH8XXX, RTH7XXX, RTH6XXX, RTH5XXX, RTH4XXX, RTH3XXX, CT5X, CT3X
3

Honeywell Home CG510A Thermostat Guard, Small
Honeywell Home CG510A Thermostat Guard, Small

$15.99
View Product
Product Highlights:

  • Clear plastic cover with built-in lock and a set of keys
  • For use with Honeywell Home thermostats. It protects against unwanted changes to AC/Heating preferred settings
  • Covers CT87, CT30,CT31,CT33 (Round) models without the wall plate
  • Outside dimensions: 5-7/8 W x 5-7/8 H x 2-1/2 D (inches)
  • Interior dimensions: 4-7/16 W x 4-7/16 H x 2-1/4 D (inches)
Sale4

StatGuardPlus Large Thermostat Cover with Changeable Code Combination. Locking Thermostat Cover Fits Most Sizes (1, Clear) SGP201401CL
StatGuardPlus Large Thermostat Cover with Changeable Code Combination. Locking Thermostat Cover Fits Most Sizes (1, Clear) SGP201401CL

$28.00
View Product
Product Highlights:

  • No Key Needed! Set Your Own Code – Change the code, not the cover. Because, who wants to keep up with another key? This thermostat has 3-digit combination lock with a changeable code which makes it easy for you to customize.
  • Easy to Install – Comes with drywall anchors and screws. Simply line up the thermostat guard around your thermostat, plug in the drywall anchors, and the screws and voila! You’re on your way to peace of mind knowing your heating and cooli heating with drywall anchors and screws. Simply line up the thermostat guard around your thermostat, plug in the dry wall anchors, and the screws and voila! You’re on your way to peace of mind knowing your heating and cooling settings will not be tampered with.
  • Fits Over Existing Thermostat – Nearly universal fit for all thermostat. Guaranteed of any thermostat measuring 7 in wide x 4.5 in height x 2 in diameter. The hinged design makes this thermostat easy to open and access your thermostat when unlocked.
  • Prevent Unwanted Changes to Your Thermostat – Great for use in offices, churches, restaurants, schools and other public areas to control your energy costs. No more sneaky hands changing your heating and cooling!
  • Made of High Quality Clear Plastic – Made of high quality polycarbonate clear plastic means you’ll be able to see straight crystal clear through the lock box to your thermostat to make sure the settings are exactly the way you want them. The material is also resistant to any stains or yellow tinting that you may see with other cheap plastic covers.
5

TayMac ZTC100 Plastic Thermostat Cover Low Profile, Small, Clear
TayMac ZTC100 Plastic Thermostat Cover Low Profile, Small, Clear

$16.18
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Product Highlights:

  • CONVENIENT TO USE – Patented rotating removable hinge makes adjusting the thermostat more convenientby eliminating the need to completely remove the cover
  • EASY INSTALLATION – Lid can be removed for ease of thermostat installation; Can be mounted in any one of four directions
  • PATENTED HINGE – Includes high strength locking features to ensure that the lid cannot be removed when closed
  • INCLUSIONS – Includes tumbler lock with two keys, mounting screws and anchors
  • DIMENSIONS – 4 7/16 x 4 7/16 x 2 1/4 inches. Outer dimensions – 5 7/8 x 5 7/8 x 2 1/2 inches
6

Lux A772001T-005 BB2001-005 Medium Locking Thermostat
Lux A772001T-005 BB2001-005 Medium Locking Thermostat

$21.99
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Product Highlights:

  • Fits thermostats no larger than 5.25W x 4.50H x 3.0D
  • Medium size – External Dimensions 6.5W x 5.875H x 3.25D
  • Limits unwanted access; Tamper resistant, strong durable plastic
  • One Key and mounting screws included
  • Larger Guard available See Model BB3001
7

Emerson G10 Universal Locking Thermostat Guard, Clear
Emerson G10 Universal Locking Thermostat Guard, Clear

$20.22
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Product Highlights:

  • Lock and key
  • Clear Plastic
  • Maximum thermostat dimensions 3 1/4″ d x 3 1/2″ h x 6 3/8″ l
8

Supplying Demand BTG-UWM Metal Thermostat Guard Universal Compatibility
Supplying Demand BTG-UWM Metal Thermostat Guard Universal Compatibility

$26.99
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Product Highlights:

  • Universal Compatibility
  • Comes in Supplying Demand packaging
  • Key and mounting screws included
  • Item is roughly 8 X 5.5 X 3.5 inches
  • This is for safe secure areas to not allow others to access the thermostat.
9

BISupply AC Thermostat Cover with Lock, AC Thermostat Lock Box Cover Thermostat Guard with Lock, 7.7 x 3.3 x 4.75 Inch
BISupply AC Thermostat Cover with Lock, AC Thermostat Lock Box Cover Thermostat Guard with Lock, 7.7 x 3.3 x 4.75 Inch

$25.99
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Product Highlights:

  • DECREASE YOUR ENERGY BILL: The BISupply | Medium Thermostat Guard is an AC lockbox for thermostat control; Constructed of heavy-duty transparent plastic allows you to clearly see your thermostat while preventing anyone from tampering with your heating or air conditioning settings and protecting against unwanted changes to preferred settings in commercial and residential areas such as an office, church, restaurant, school, or home
  • FITS YOUR THERMOSTAT: Fits over existing thermostats up to 6.25” x 3.7” x 2.7” inch (15.9cm x 9.4cm x 6.9cm) – This is the inside dimensions of the AC lock box cover; 1.6” x 1.8” inch (4.1cm x 4.6cm) irregular shaped backside hole for thermostat wires to wall; Measure your thermostat length by depth by height to ensure correct fitment; Open hinge allows cover to come apart into 2 separate pieces when opened; 7.7” x 3.3” 4.75” inch (19.6cm x 8.4cm x 12.1cm) outside dimensions (OD)
  • NO TEMPERATURE FLUCTUATION: AC control cover is ventilated on all 4 sides to avoid interference with detection of current temperature by your thermostat
  • EASY TO INSTALL: There are 2 separate parts – The back plate (opaque piece) mounts to the wall, your thermostat mounts on the back plate, and the cover locks on the back plate; To install without removing thermostat from wall, only install clear cover and not back plate; Mounting screws included to affix to any surface; Phillips screwdriver required for installation, not included
  • PACKAGE CONTENTS: Thermostat box cover package includes (1) locking cover for thermostat with base, (1) key, and (8) mounting screws for your convenience
10

Honeywell CG512A Large Thermostat Guard with Inner Shelf to Prevent Tampering (2)
Honeywell CG512A Large Thermostat Guard with Inner Shelf to Prevent Tampering (2)

$38.90
View Product
Product Highlights:

  • Fits all Honeywell and most other thermostats
  • Clear plastic cover that resists yellowing; The Honeywell CG512A1009 Large Thermostat Guard provides the ideal defense in preventing others from tampering with your heating and cooling options.
  • Key lock with inner shelf to prevent tampering
  • Protects unwanted changes to AC/Heating preferred settings
  • Ultra clear acrylic resin cover and base resists the yellowing effects of chemicals and UV-light

Video Overview

Locking Thermostat

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Final Words

So, these are all of the Best Thermostat Locks available on the market. We hope this collection was helpful to find the right Thermostat Lock for the money. However, we recommend checking out the features, benefits, and problems of each of these Thermostat Locks before taking your decision.