We have a wood-frame house with 2x4 studs and half-inch plywood exterior walls. What is the generally accepted best practices for mounting a 80lb mini split condenser on a wall bracket to this type of wall?

The advice on the Internet appears to center around getting it on the studs. Unfortunately, due to installation location constraints, it turns out we couldn't get the unit to sit directly on studs.

There are three bolts on each bracket, and they're 3/8" diameter. They were screwed in tightly into the plywood and hold the machine up. Based on charts of plywood pull out strengths online, it appears that there is enough safety margin with this setup.

The question I have is whether or not this is generally considered an acceptable install, and if not, what steps can be taken to upgrade the mounting. Perhaps extra wood supports to bridge the unit over to studs? Worst comes to worst maybe the unit may need to be remounted, but this is difficult.

What is the best course of action in this case?


  • How high up from the ground is this unit mounted? Do people and animals walk below it? Is this located in an earthquake area? My initial reaction is that the plywood will hold this unit. – Jim Stewart Aug 16 at 10:43
  • The unit is about 7 feet off the ground. It's mounted right next to a chimney, so nobody is going to walk UNDER it. With that said, it's located on the side of the house where people walk past to go to access the alley. This is supposed to be an earthquake area, but we've fortunately not had one yet. The unit is mounted quite close to the wall (doesn't affect airflow much, it's a small unit) so there's not an undue amount of torque being generated. – larryqiann Aug 16 at 20:23

I would leave it as is, but of course check it on a schedule. The plywood is probably attached to the studs with siding nails, but plenty of them and this achieves support by friction.

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