Should an outdoor heat pump be bolted down?
Heat pumps installed on shifting plastic pads without anchor bolts risk movement and structural stress. This lack of secure footing, combined with buckling pads, creates uneven surfaces where water pools against metal feet and housing, leading to premature rusting.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Placing thick pavers under the feet to raise the unitDid this help you?
- 2Securing the unit with a rigid pipe brace attached to the wallDid this help you?
- 3Suspending the unit with cargo straps to modify the baseDid this help you?
- 4shoving gravel underneath and hammering it in until levelDid this help you?
- 5Bolting units down to concrete slabs using tapcons and washersDid this help you?
- 6Installing security cages around unitsDid this help you?
- 7Assembling cyclone fences around units in high-theft areasDid this help you?
- 8Setting up video surveillanceDid this help you?
- 9Installing alarm systems that trigger sirens when a disconnect is turned offDid this help you?
- 10Building a dedicated frame with shade nettingDid this help you?
- 11Relocating the plants to a naturally shady areaDid this help you?
- 12Placing taller shading plants in front of the vulnerable onesDid this help you?
- 13Monitoring the leaves for yellowing or crispy patches before deciding to add shadeDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I am in Texas and recently had a heat pump installed and there are aspects of this install that are concerning me. They installed the heat pump on a plastic pad they put on top of the concrete pad the old condenser unit was sitting on”source ↗
“There seems to be a lot of water pooling where metal touches it. The green squiggly line is water pooling. Will that cause rusting of the feet and housing? Is that amount of sweating normal?”source ↗
“I feel like this unit should be bolted down, is that right?”source ↗
“Is the plastic pad buckling in the middle causing the water to pool? I’d want it directly on concrete with a slight pitch away from the house.”source ↗
“Measure around the pad and leave 6”, use 4x4s and anchor into the ground and make a retaining wall, only way it’s going to stop eroding.”source ↗
“I have a had nine units stolen in the last three weeks.”source ↗
“i need a lower cost solution i have to deal with about 50 units that are easily accessible from the street that are being taken”source ↗
“What should I do to support this pad and prevent it from eroding more.”source ↗