Four calendars, not one
A shop that treats the whole year as one season calls the right customer in the wrong month all year long. The engine keeps these four apart, and a record only ever sits in one of them.
Cooling
Nobody books a tune-up in the first heatwave — they book an emergency. The lift is in the weeks before.
AC, condensers, heat pumps, mini splits, rooftop units
Heating
Same logic, other end of the year. A furnace conversation in September is planning; in January it is a rescue.
Furnaces, boilers, air handlers, gas packs
Water
Tank failures cluster in cold months and over the holidays, when the house is full and the hot water runs out.
Water heaters, tankless, softeners, filtration
Roofing
Weather-shaped and crew-shaped. Spring and early autumn are when a homeowner will actually schedule the work.
Roofs, shingles, shake, slate, gutters
The split matters more than it looks. “Water heater” contains the word heat, and reading that list carelessly files every tank under furnaces — which hands it the wrong autumn lift and, worse, a summer penalty on a tank that died in July. Water is decided first here for exactly that reason.
Month by month
What rises, what sags, and what that leaves you to do. The multipliers are the real ones; the line underneath each month is drawn from that month’s own row, not from an opinion.
Push water
Up: water ×1.15. Down: cooling ×0.85 and roofing ×0.88.
A split month. Work the lane that is rising and leave the other one alone.
Nothing seasonal
Down: cooling ×0.85 and roofing ×0.88.
Nothing is being pushed up. This is a month for the piles the calendar never touches — unsold quotes and deferred repairs.
Push cooling
Up: cooling ×1.20.
One clear lane. Everything else is ranked on its own merits this month.
Push cooling and roofing
Up: cooling ×1.20 and roofing ×1.15.
One clear lane. Everything else is ranked on its own merits this month.
Push cooling and roofing
Up: cooling ×1.20 and roofing ×1.15.
One clear lane. Everything else is ranked on its own merits this month.
Push cooling and roofing
Up: cooling ×1.20 and roofing ×1.15. Down: heating ×0.85.
A split month. Work the lane that is rising and leave the other one alone.
Nothing seasonal
Down: heating ×0.85.
Nothing is being pushed up. This is a month for the piles the calendar never touches — unsold quotes and deferred repairs.
Nothing seasonal
Down: heating ×0.85.
Nothing is being pushed up. This is a month for the piles the calendar never touches — unsold quotes and deferred repairs.
Push heating and roofing
Up: heating ×1.20 and roofing ×1.15.
One clear lane. Everything else is ranked on its own merits this month.
Push heating and water and roofing
Up: heating ×1.20, water ×1.15 and roofing ×1.15.
The broadest month on the calendar — more lanes lift at once than in any other.
Push heating and water
Up: heating ×1.20 and water ×1.15.
One clear lane. Everything else is ranked on its own merits this month.
Push water
Up: water ×1.15. Down: cooling ×0.85 and roofing ×0.88.
A split month. Work the lane that is rising and leave the other one alone.
What the calendar will not do
Seasonality is the easiest thing in a tool like this to overdo, and overdoing it is how you end up ignoring a live customer because it is the wrong month.
It never re-times a quote
Unsold quotes, unsold repairs, deferred repairs, missed calls, repeat repairs and warranties ending are all left exactly where they are. Only four categories move: aging system, maintenance due, membership expiring, lapsed member.
It is a nudge, not a gate
The whole swing is between ×0.85 and ×1.20. It reorders records that were already close together. Nothing is hidden because of the month, and nothing is promoted past a warmer record.
It is capped with everything else
Season is one of five customer factors, and their combined effect is capped so a record cannot stack a good month on top of four other favourable facts and claim certainty. The cap is on the model page.
It is not local weather
These are ordinary trade seasons for a four-season climate. If you are in Phoenix or Anchorage the shape is different, and the honest thing to say is that the table does not know where you are.
Questions this raises
When is the best time to sell HVAC maintenance plans?
Before the season, not during it. Backlog lifts cooling work in March, April, May and June and heating work in September, October and November — the weeks when a homeowner is thinking about the season ahead rather than living through it. Once the first heatwave or cold snap lands, the same call competes with your own emergency board.
When should a plumber chase ageing water heaters?
Water work lifts in January, October, November and December. Tank failures cluster when the house is cold and full, and a tank that dies at 2am gets replaced by whoever answers the phone — so the call that matters is the one made months earlier.
When do roofing calls land best?
Roofing lifts in April, May, June, September and October — the windows when a homeowner will actually schedule the work and a crew can actually do it. It is weighted back down through the winter.
Does the calendar change what my quotes are worth?
No. Only four kinds of record are re-timed by the calendar: tune-ups due, plans about to renew, plans already lapsed, and ageing equipment. An unsold quote and a deferred repair are never moved by the month — a $9,000 changeout you quoted in June is exactly as unsold in February.
How big is the seasonal effect, really?
Small on purpose. The whole calendar moves a record between ×0.85 and ×1.20, and it is one of five customer factors whose combined effect is capped. Season decides the order of two records that were already close; it will not put a cold lead above a warm one.