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A.Dave Yates, a plumbing contractor in York, Pa., responds: One way for corner-cutting hvac installers to avoid clogs — and eliminate altogether the expense of traps and condensate pumps — is to simply drill a hole in the concrete floor and drain the condensate directly into the stones under the slab. But this is a bad idea, for a couple of reasons.
First, instead of clogging the drain trap on its way to the condensate pump, the condensate will collect in the subslab. To get rid of it, a pro will need to come and pull the line, cement the hole shut, and — yes — install a condensate pump and trap.