For hvac contractors specifically: HVAC demand has the largest job tickets of any home-services trade — $5,000 to $20,000 installs, plus recurring service contracts — and is dominated by extreme-weather demand spikes. In hot climates the August heat event drives the year. In cold climates the first freeze does the same. The contractor whose site, schema, and AEO presence is built before the spike captures the spike; the one who waits captures nothing.
Climate & seasonal drivers in Phoenix: Extreme summer heat drives concentrated, high-urgency HVAC demand. Hard-water conditions sustain plumbing service pipelines. Solar adoption drives substantial electrical work.