I put this in a closed 100 SQ ft room with a starting temperature of 66. The temperature sensor was on a desk about 4' away from the heater on the floor. On the high setting, after one hour the temperature was still 66. The heater was hot to the touch. I think the problem is there isn't enough surface area to make a difference. Other more expensive heaters have much more heated surface area.
1500W PTC Ceramic Electric Space Heater With 60° Oscillating Tower Fan, Thermostat & Overheat/Tip-Over Protection For Office Home Bathroom Large Room Indoor Use (32 Inch)
51 Review
Convector Electrolux Air Stream ECH/AS-1500 MR, white
44 Review
TRUSTECH Outdoor Patio Heater - Adjustable 1500W Waterproof Heater With Rapid 3-Second Heating, IP34 Protection, And Tip-Over Safety Feature For Balcony, Backyard, And Garage Use
45 Review
1500W Electric Patio Heater With Remote Control, LCD Display, 24H Timer - Fast & Quiet For Large Room/Garage
42 Review
🥛 Electrolux EACS-12HG2/N3 Split System Air Conditioner with Milk Cooling Feature
12 Review
Split system Roda RS-AL09F / RU-AL09F
37 Review
UL Certified 120V Unheated Awoco 48 Super Power 2 Speeds 1650CFM Commercial Indoor Air Curtain With Free Door Switch
23 Review
🥶 LG TC09GQR Split System Air Conditioner - White
11 Review