Install two mitsubishi sez model ducted minisplits in the attic.
Attic firewall installation.
An hvac contractor has taken a look at the house and has a recommendation inverter explains in this q a post.
One solution is to install a firewall in the attic between the garage and dwelling.
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Attic access installed in an attached garage firewall.
Even if the garage attic is completely separated from the house attic or house walls don t back up to it open access creates a vacuum and garage fire will be sucked into the attic keep it closed at all times check drawings in comment section below for some tips.
Pricing depends on the size of your attic the type of insulation material used and labor rates.
One issue in providing a solid firewall is a pull down or retractable ladder to a loft in the garage ceiling.
While there are fire rated units most homeowners install a less.
One will cool the master bedroom the other will cool the two bedrooms where inverter s children sleep.
Another common homeowner mistake is to install recessed lights in the garage.
This gap will allow a fire to get into the attic and is a breach of the firewall.
Wood pull down ladders are acceptable when a firewall exists in the attic between the areas above the garage and house.
Fire rated pull down ladders are available.