February traffic arrives from a cold bedroom at ten at night
The visitor profile in a real winter market is a homeowner who just felt the draft, on mobile, alone, and unlikely to call until morning.
Design for that person and the rest follows. Large tap targets, a form above the fold on mobile, a phone number that dials on tap, and a clear statement of what happens after they submit.
Because the visit often happens after hours, the site is the only salesperson on duty. An after-hours submission should return an immediate confirmation saying when a human will call, and the callback should happen when promised. Silence overnight is where most of these inquiries die.
Desktop still matters for the comparison stage. Someone reading about insert versus full frame at the kitchen table on a laptop is closer to a decision than the midnight visitor, and they need longer content and clearer specification detail.
Do not build a site that only looks right on the office monitor. Test it on an ordinary phone in a driveway in Bellevue or Donelson, on whatever signal you actually get there.