I'm replacing my AC and furnace, I've gotten 3 bids so far. I'm waiting on the numbers for the final bid. Only one out of the 3 did any type of load calculation. It read my house 1600 to 1700sqf house needed 38,000 BTU's of cooling. By the way he was selling Bryant. He said 3 Ton is 36,000 and a 3.5 Ton was 42,000. He went with the 3.5 since the house needs 38,000. Do these numbers sound about right?