I AM PLANNING TO BUY A HEATPUMP AND WOULD LIKE TO KNOW WHAT BRAND IS THE BEST TO BUY? I ALSO WOULD LIKE TO KNOW BIG A HEATPUMP I WOULD NEED TO HEAT AND COOL MY HOUSE? THE FIRST FLOOR IS 840SQ/FT THE MAIN FLOOR IS 1020SSQ/FT AND THE BASEMENT IS 1020SQ/FT.