The Visalia station's heat record
NOAA's climate normals for the Visalia station give 1,742.6 cooling degree days and 2,409.6 heating degree days in a normal year. The same normals count about 94.6 days a year with a high of 90°F or more and about 11.4 days of 100°F or more. These are long-run averages for one station, and they are the backdrop for almost every scheduling choice on an exterior job here.
Air temperature is not wall temperature
Paint labels give a temperature window for application, and most painters read the thermometer on the truck. The number that matters, though, is the temperature of the surface. A wall in full afternoon sun, especially a dark one, runs far hotter than the air around it. Paint put onto a hot surface:
- skins over before it levels, leaving brush and roller marks;
- shows lap lines where a fresh stroke overlaps one that has already started to set;
- can blister when the outside skin traps moisture or solvent below it;
- may not bond as well as the label intends.
An infrared thermometer settles the argument in seconds. Ask whether the painter uses one, and what they do when a wall reads above the label's limit.
Following the shade around the house
On a day that will be hot, a crew can still work if it moves with the sun. The usual pattern is to start on the walls that are shaded in the morning, move to other sides as the shadow comes round, and leave any wall that bakes all afternoon for an early start the next day. A proposal that allows for this takes longer on paper but tends to produce a smoother finish.
Things that help:
- Starting early and stopping before the hottest hours on sun-struck walls.
- Keeping open cans out of the sun and boxing paint so the color stays consistent.
- Wetting down the surrounding hardscape before cleanup rather than hosing fresh paint.
- Using the product's extender or a slower-drying formula where the maker allows it.
Indoors while the cooling runs
The cooling degree day figure is a measure of how much cooling the normal year calls for. For interior work, that means rooms are often closed up with the air conditioning running. Air conditioning dries the air, which helps paint dry, but a vent blowing straight across a freshly rolled wall can dry the edges first and leave flashing. Ask the painter to angle or close the room's vents during the wet stage and to reopen them once the coat has set.
Interior jobs also have their own preparation: patching, sanding, spot-priming and protecting floors. Our interior painting page walks through that sequence, and the paint sheens guide explains why flat finishes hide patch work better than glossy ones.
Surfaces that take the most punishment
On an exterior, sun exposure is rarely even. Fascia, window trim and doors on the most exposed sides usually fade and crack first. When you get a proposal, check whether those pieces get extra preparation or an extra coat, and whether the painter suggests a product meant for high sun exposure. Our exterior painting page explains the options for stucco, siding and trim.
What CSLB says about when a license is required
CSLB says a license is generally required when the total cost of labor and materials on a project is $1,000 or more, or when the project needs a building permit or uses additional workers. That is the board's statement as quoted in the card below; read the linked page for the full wording. If you're not sure how it applies to your job, ask the painter.
Questions worth asking
- Which walls will you paint first, and at what time of day?
- How do you check surface temperature before painting?
- What will you do on a day too hot to paint a given wall?
- Will you adjust or close vents while interior coats dry?
- How many coats go on the trim and doors that take the most sun?
Our pricing guide explains why careful scheduling shows up in the proposal.