most efficient space heater

Lifesmart 4-Element Quartz Infrared Portable Electric Space Heater (3 Pack)

Lifesmart 4-Element Quartz Infrared Portable Large Room Electric Space Heater, Black (2 Pack)

Mojgar Electric Space Heater with Remote Control, 2-Level Adjustable Quiet Ceramic Heater Fan

Lifesmart 6 Element 1500 Watt Electric Portable Programmable Infrared Quartz Space Heater with Remote Control, Dark Oak (2 Pack)

R.W.FLAME Electric Fireplaces, 1500W Infrared Electric Stove Heater, Efficient Heating, 3D Realistic Flame, Remote Control, 8H Timer,5100 BTU

DeLonghi Capsule Ceramic Indoor Heater

Optimus 9 Inch Electric Dish Heater

BLACK+DECKER Portable Heater for Rooms up to 161 Sq. Ft., Black

Comfort Glow Electric Log Insert Heater With Firebox Projection - 5,000 BTUs

Frigidaire Oscillating Space Heater White

VOLTORB Freestanding Portable Electric Space Heater for Bedroom or Indoor Use with LED Display, Remote Control, and Programmable Thermostat, Black

Acekool Portable Infrared Heater - 3 Heat Settings, Remote & Timer, IP34 Weather Resistance for Patio Deck Backyard

Genesis® 350-Watt Compact Corded Heat Gun in Gray

R.W.FLAME Electric Fireplace Stove Heater with Thermostat Control, 3D Realistic Flame Effects, Adjustable Heating Mode, Overheating Safe Design

Costway 9000 BTU Mini Split Air Conditioner & Heater with 0.75 Ton Pre-Charged Heat Pump

ZAFRO Electric Fireplace Heater 17" with Remote Control, Cathedral Stylish, Different Flame Effects and Log Set Colors, Adjustable Brightness , Beige

Costway 27'' Freestanding Electric Fireplace Heater w/ 3-Level Flame Thermostat

Acekool 20" Electric Fireplace Insert - Realistic LED Flame & 1500W Heater for Indoor Rooms, Faux Log Design

Garage/ Shop Ceiling Mount Utility Heater

R.W.FLAME 12000BTU Smart Inverter Window Air Conditioner AC Unit, Cools Rooms up to 550 Sq.Ft, Remote Control, Quiet Cooling, Enegy Saving

Lasko 5919 Pro-Ceramic Utility Heater

R.W.FLAME Oil Filled Radiator Heater, Adjustable Thermostat, 3 Heat Settings, Portable Quiet Heater with Tip-over & Overheating Functions, BLACK

Kismile Electric Fireplace, Realistic Flame Effects Fireplace Heater Stove, Adjustable Brightness and Heating Mode, Overheating Safe Design (Black)

ZAFRO Electric Fireplace Log Set Heater, 21" Vintage Design Portable Freestanding Fireplace Log Heater,Realistic Flames,Realistic Ember Bed for Home