Multiple units are common for a large house. Not because they want a backup but because there are limits to how many square feet a single home unit can handle. Having a 2nd story or basement can influence the decision too. It’s often cheaper to put in two home units vs upgrading to a large industrial size like what a store might use.
Obviously if you have 2 then one is a backup when you have a problem, but most people aren’t going to have that.
Multiple units is usually a matter of cubic feet, not backups. A single unit can only cool so much air, so larger houses often need multiple units to achieve enough cooling. It could also be an area control thing, like maybe the upstairs unit is separate from downstairs, so you can cool upstairs even when downstairs is already cool. Because hot air rises, so upstairs tends to be warmer.
My friend in Vegas said it’s relatively common to have two a/c units so you have a backup. Is that a thing in AZ?
Multiple units are common for a large house. Not because they want a backup but because there are limits to how many square feet a single home unit can handle. Having a 2nd story or basement can influence the decision too. It’s often cheaper to put in two home units vs upgrading to a large industrial size like what a store might use.
Obviously if you have 2 then one is a backup when you have a problem, but most people aren’t going to have that.
Multiple units is usually a matter of cubic feet, not backups. A single unit can only cool so much air, so larger houses often need multiple units to achieve enough cooling. It could also be an area control thing, like maybe the upstairs unit is separate from downstairs, so you can cool upstairs even when downstairs is already cool. Because hot air rises, so upstairs tends to be warmer.
Not at all