Infrared electric space heaters use the same amount of electricity as other space heaters do.
Space heaters that plug into 120 volt outlets including infrared space heaters use 1500 watts of electricity per hour so can cost 10 to 13 cents per hour to run depending on your cost per KWH of electricity.
An infrared space heater including other space heaters can cost as much as $1.80 to $2.00 per day to run for each space heater just for 12 to 14 hours of use per day.