Hi i have recently bought a brand new home, the house is 2400 sq feet. i kno there is a general rule of 500sq?

wat size air conditioner should i get, i have read that a general rule of 500 sq/per ton. i feel this is inaccuratee...as it says i need a 4.8 ton air conditioner i feel this to be inaaccuate as i read in other answers that a 1560 sq foot house is well cooled by a 1.5 ton air conditioner...i must mention that my house is brand brand new..not even a year old..so all the furncae is all new...and everything i think is properly insulated..i live in toronto, it usually reaches temperatures of 28 34 with humidity, also because of my hosue i get alot of sunlight....i do not wanna oversize my airconditioner..i heard there is sumthing called the Manual J is there anyway i can use that soo i can have the knowledge of wat size i need without the contractors tellin me wat size i need?

Answers:
The average is 1 Ton per 400 Square Feet. 1 Ton/500 SF is the most efficient. This is about energy efficiency/usage not what is able to cool your home. See this article:

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