It has its own thermostat. You can turn it down (usually) on the unit.

keep the heater away from curtains and the back of the desk and anything else that is flammable or melts. Stay safe.

Another option is slippers.

1895 ad larkin soap chair oil heater desk $26.99

Safe Optimus Electric Radiant Portable 9" Room Desk Personal Space Dish Heater $27.99

New Coffee Cup Warmer 4 Port USB Hub Desk Mug Heater Time Clock PC Laptop Gadget $18.90

Indus-Tool Under-Desk Radiant Heater-150W 1.35 Amp #CL $49.99

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PELONIS HC-0120 1500 WATTS SAFE-T-FURNACE HEATER DESK SHOP PLAYROOM $5.00

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Safe Optimus Electric Radiant Portable 9" Room Desk Personal Space Dish Heater $27.99

Optimus H-4110 9-Inch Dish Space Desk Heater NEW! $26.55

Safe Optimus Electric Radiant Portable 9" Room Desk Personal Space Dish Heater $27.99

Optimus Small Quiet Portable 9 Inch Fan Dish Office Desk Infrared Space Heater $28.99

OSCILLATING FAN HEATER 1500 WATTS, EVERSTAR Under office Desk, Foot & Leg Warmer $9.95

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USB Cup Warmer Coffee Tea Heater PAD OFFICE+ 4 Port Hub desk top laptop desktop $0.01

QMark Radiant Under Desk Heater $106.95

Holmes HFH442-UM Convection Heater Electric - White - Desk Thermostat Plastic $46.83

WarmlyYours UDH1-01824-120M Under Desk Electric Plug In Heater 18" x 24" - Merlo $153.60

Marley Under Desk Flat Panel Radiant Heater #202SL, NIB, Only 170 Watts! $49.95

Home Office Table Desk Cup Mug USB 2.0 Warmer Heater $17.39

USB Hub with desk Coffee Heater 4x 1.1 ports *USA. $8.00

USB Hub with desk Coffee Heater 4x 1.1 ports *USA. $8.00

Safe Optimus Electric Radiant Portable 9" Room Desk Personal Space Dish Heater $27.99

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Home Office Table Desk Cup Mug USB 2.0 Warmer Heater $15.22

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NEW! QMark Under Desk Heater model number 202SLB $85.00

Under Desk Radiant Heater - Qmark 202SLB -Warm at Work! $29.99

PERSONAL OFFICE DESK CUBICLE SHOP PORTABLE ELECTRIC HEATER 120 VOLT 1500 WATT $59.95

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NEW Cozy Legs Electric Compact Portable Under Desk Space Heater Leg Foot Warmer $54.98

Home Office Table Desk Cup Mug USB 2.0 Warmer Heater $17.39

Cozy Legs Space Heater and Portable Stand - 150 Watt Flat Panel Desk Leg Warmer $61.39

Home Office Table Desk Cup Mug USB 2.0 Warmer Heater $15.24

NEW Cozy Legs Flat Panel Leg Feet Space Heater Wall Mount or Under the Desk $51.98

800 Watt Halogen Heater (Desk Or Floor Standing) £11.43 800 Watt Halogen Heater (Desk Or Floor Standing) The 800 W Halogen Heater is compact and easily portable with an integrated carry handle. Featuring 2 heat settings (Low 400 W/High 800 W), his heater uses energy efficient radiant technology to heat you rather than the air and has a safety grille and safety tip over cut-off Tip over safety cut-out, Overheat safety cut-out 1 Year Warranty, 345x35...

Dyson AM04 Hot Fan Heater with Air Multiplier Technology £235.00 The Dyson Hot fan heater uses Air Multiplier technology for long range heat projection to heat the room evenly. There are no fast-spinning blades or visible heating elements, so its easy to clean. Theres also an automatic cut out that switches off the unit if its tipped over...

Dyson Air Multiplier AM01 10 Inch Desk Fan (White/Silver) £166.99 Dyson Air Multiplier 10" Desk Fan 3kg...

eGadget Desktop USB Cup Warmer...Built in 4 Port USB Port for Use with Desktops / Laptops / Notebooks / Netbook / iMac / Macbook £2.99 We've all been there. You've just brewed yourself a steaming cup of liquid loveliness, you get back to your desk to a flurry of urgent emails and by the time you've averted all manner of minor disasters like the superhuman workhorse that you are, your cup of steaming refreshment is stone cold. Worry not, office warrior, as we have a solution to your tepid tea dilemma in the rather lovely form of ...

LUPO USB Mug Warmer with 4 Integral Port USB Hub £4.99 Ever get too involved with your work on your computer only to find that the delicious hot coffee / tea you made is now ice cold? Keep your drinks warm with this USB powered Cup Warmer which also includes a 4 port USB Hub. Simply plug this device into a spare USB port onto your computer and turn on using the power button. Within seconds you will be able to feel the heat from the warmer and within 2...