The contractor uses all of this information to calculate the heat load to verify that the existing equipment is correctly sized and proposed equipment is also correctly sized. You should receive a written estimate.For More Details Visit us at https://www.budgetairandheat.com/ or contact us at 909-860-9537, Address :- Diamond Bar, CA #BudgetAirConditioning&Heating,Inc. #HeatingServicenear #DiamondBar #CA