Ragweed Season in Shawnee: August Through First Frost

Weed season in Oklahoma runs from August through October and is driven mostly by ragweed, with pigweed, lamb's quarters and Russian thistle along for the ride. It overlaps almost exactly with the tail of our cooling season, so in Shawnee you get peak pollen and heavy air conditioner runtime at the same time.

That overlap cuts both ways. A properly sealed house running its AC is one of the better places to be during ragweed season, because you are recirculating and filtering rather than opening windows. But the same runtime means anything wrong with your filtration or duct sealing gets amplified for three straight months.

Out through Bethel Acres and Pink the addresses turn rural fast, with open ground on every side and equipment that often sits in a garage or utility room rather than conditioned space.

The single most common thing we find on these calls is a return that leaks. If the return side of your duct system is pulling from an attic, a crawl space, or a wall cavity instead of from the rooms, you are drawing outdoor air — and outdoor pollen — into the system continuously and then distributing it. Sealing that is usually a bigger win than any filter upgrade.

Do not forget the outdoor unit either. Ragweed and grass debris pack into a condenser coil over a season, and a dirty coil raises head pressure, costs efficiency, and shortens compressor life. A rinse at the end of the season is cheap insurance.