Loads that take two cycles and a laundry room that runs hot.
What a dryer vent is, why lint build-up is a fire risk, the signs of a blocked run, and what cleaning or replacing it costs.

What the vent is, which materials are safe (rigid or semi-rigid metal, never plastic or foil), the signs it is clogged, and the replacement price. Fire facts from the US Fire Administration.
What a vent installation costs, why length and elbows matter (follow the dryer maker's limits; we make no code claims), and when it is a pro job.
The signs of a blocked or damaged vent (long dry times, hot laundry room, lint at the hood, burning smell) and what a repair or cleaning costs.
What a dryer vent cleaning costs, how often, and what a fair visit includes.
What a brush kit costs and does, and when paying a pro is the better buy.
Louvered vs flapper vs no-screen hoods, pests and lint, and the price. Screens trap lint: say why.
What a recessed vent box solves (crushed hose behind the dryer) and the price.
What an indoor lint trap does, why it is for electric dryers only and never gas (carbon monoxide), and the moisture cost.