How manu sf is it rated for?

Rule of thumb for heating as a PRIMARY SOURCE is 10 watts per soft. Thus if you have a 16x22 garage (352sqft) you’d need a minimum of 3,520 watts. For 400 sqft you’d need 4000 watts. This does 150 sqft! This around 10x15 or for a small shed 20x7.5... this assumes adequate insulation too. I used it in a garage that was insulated and it did nothing. If you stood 6 inches from the heater you could feel it but that’s it.

Is there an automatic shut-off feature after a certain number of hours of operation?

There is, via the timer feature -- it can be set to turn on and off as often as you want via that function. It also fully shuts off the heater elements and fan after reaching the temperature (within 2-3 degrees of variation as others have written here). The WiFi feature is GREAT.. combined with the Sensei app you can turn it off manually, remotely too! This was awesome when my teenager accidentally left the door open while we were out of town... I saw on my phone that the room was much cooler than what the heater was set to (it gives you both current temp and desired temp in the app) and I shot her a text message ... within 10 minutes it was back up to temp in the room (and she shut the door.. *headdesk* ) :-)

How do I know if this is 'energy efficient' as the description claims?

All electrical resistance heaters convert 100% of the energy they use to heat. The efficiency question comes in, as Heat Storm says, when you ask where is the heat going (fan blows it into the room where you are - so good) and does it create too much heat (thermostat shuts it off when the air is warm enough - good). The answer from Amazon Customer on December 7, 2020 is incorrect. Every last watt will become heat in the room, even the light from the glowing element will become heat in the room unless you point the heater out an open window - don't do that, and you're all set.

Are you able to change the temp using google home? How do you get google home to tell you the current temp in F?

Hello again! Thanks for being patient. Google home can now operate in Fahrenheit. To do this, please unlink Smart Life from Google Home. Then confirm that your heater is displaying the temperature in Fahrenheit. Once you have your heater settings on Fahrenheit, relink Smart Life to Google Home. Now you will be able to operate your heater with Google home in Fahrenheit. If you want to change the settings back to Celcius, you will need to unlink Smart Life from Google Home, set your heater to Celsius, and relink. Thank you, EnergyWise Solutions

Heating Coverage	150 ft² Primary, 750 ft² Secondary
Heating Element	Corded Electric
Heat Output	5200 British Thermal Units
Fuel Type	Electric
Amperage	1500 Amps
Voltage	120 Volts
Heating Method	Infrared Quartz
Recommended Uses For Product	Office, Garage, Bedroom, House, Home
Mounting Type	Wall, Floor
Room Type	Bedroom, living room, dining, kitchen, kids, nursery, home office, pets
Additional Features	Child Lock, Tip Over Switch, Infrared Quartz
Form Factor	Cabinet
Indoor Outdoor Usage	Indoor
Power Source	Corded Electric
Item Weight	9 Pounds
Item Dimensions D x W x H	18.75"D x 4.5"W x 12.75"H
EU Spare Part Availability Duration	2 Years
Color	WHITE

Heat Storm Phoenix Infrared Space Heater with Attachable Feet, Remote Control, Energy Efficient-750-1500 Watts, White Floor or Wall - HS-1500-PHX

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