IF YOU ARE HEATING YOUR HOME WITH A PORTABLE HEATER. IT DOES A GOOD JOB ON 2 ROOMS.  IT WOULD COST US MORE TO REPLACE OUR GAS FURNACE DOWNSTAIRS SO A PORTABLE HEATER WOULD BE GREAT AND IT DOES NOT RUN UP THE ELECTRIC BILL NEITHER.OF COURSE YOU NEED A PORTABLE HEATER IN EACH DOWN STAIRS ROOM TO BENEFIT THE COLD OUTSIDE TEMPERATURES. THE HEATER IS GREAT IF YOU TIP IT OVER BECAUSE IT SHUTS OFF. THERE IS A HEAT ADJUSTMENT ON THE SIDE TO MOVE YOUR HEAT LOW TO THE FLOOR OR HIGH TO THE CEILING. IT HAS AN AUTOMATIC SWITCH TO TURN IT ON WHEN IT GETS A CERTAIN TEMPERATURE IN THE ROOM SO IT TURNS ON BY ITSELF....