Every other outdoor component gets a cabinet. The condenser pad sits on grade with a full unit on top and nothing over it, taking direct sun most of the day from May through September. Sprinklers shower it two or three times a week and fertilizer and weed treatments coat it, all while supporting hundreds of pounds of equipment. Suffice it to say, the pad does work. Of course, a single day of this kind of exposure isn't that bad, but it's not just a single day. Over time, the sun works on a cheap plastic pad, while water, dissolved salts, and load work on concrete, so the two materials still end up failing, just in different ways.
How Concrete Pads Break Down
Concrete is porous. Water works into the surface, carrying in fertilizer salts off the lawn and minerals out of hard irrigation water. Where the climate freezes, that water expands inside the pad and pushes the surface apart, so the concrete spalls where it stays wet. The salts stay behind as stains on the light gray surface, and those won't scrub out.
Water gets under the pad, too. Runoff off the roof and spray from the sprinklers carry soil out from under an edge, and concrete doesn't bend to follow ground that drops away. The pad spans the void until the stress cracks it, and a heavier pad puts more load on the soil that's still underneath.
A Concrete Pad is Hard to Handle Solo
Setting a concrete pad ties up a second tech who could be running another call. Taking one out needs two people again, with a charged unit sitting on top.
The old pad also has to go somewhere. Breaking it up and hauling it off takes time and truck space at the end of the job. And a pad that's been down for years has settled under its own weight and the unit's, so it doesn't come up clean.
Where Cheap Polyethylene Pads Fail
Two pads can be the same plastic, the same thickness, and the same price, and still look different after two summers. The difference comes from the UV stabilizers mixed into the resin.
Sunlight breaks polymer chains. It’s a process called photo-oxidation, and once it’s started, the reaction keeps going. It shows up first as a chalky film that rubs off on your hand. Then the pad stiffens and loses its flex. Then it cracks under the weight of the unit.
Polyethylene without stabilizer can lose measurable strength within its first year of hard sun in a hot climate. Carbon black absorbs the UV and turns it into heat, and other additives interrupt the reaction once it starts. A pad made with them gets rated in decades. One made without them can lose strength in its first year of hard sun.
What Separates One Polyethylene Pad From Another
"UV resistant" turns up in the product listing for nearly every plastic pad sold. No standard defines it and no test backs it, so two pads can carry the same phrase and one of them starts breaking down after two years of exposure.
The pads you see on service calls tell you more than any catalog page. One that's been under a unit for three or four years in your climate has already been through what a new one is about to face. Note which brands are still flat and still flexible, and which leave powder on your hand.
What PolarPad Handles
PolarPad is injection-molded polyethylene with a textured top, rounded edges, and corners that hold up to the mower and the weed eater. It resists oils, refrigerants, and pet waste. Weights run from 6.0 lbs at 24" x 24" x 2" to 37.5 lbs at 52" x 52" x 3", which means a single tech can carry every sized pad. Load ratings run from 1,210 lbs to 2,100 lbs, with the pad fully supported on compacted soil, gravel, or a hard surface.
A contractor at the supply house picking up equipment for an install, mentions he needs a pad too, and whatever's on the shelf is what goes under the unit. That pad takes on months of sun, sprinkler spray and lawn chemicals a few times a week, and hundreds of pounds of equipment on top, which is a lot to leave to whatever's in stock. You need to know that the pad holding that newly installed equipment can handle everything that’s going to be thrown at it. You should ask for a PolarPad.