Every HVAC and plumbing operator knows the shape of the year: a scramble in July, a scramble in January, and two quiet valleys in between where the phone slows down and payroll does not. The valleys have names - April and October, the gaps between the last heating emergency and the first cooling one. They arrive on schedule every year, and most shops meet them the same way: trim hours, burn cash, wait for weather.
Not another list of five tips - this is an actual four-week calendar you can run in April and again in October, with the outbound math, the exact text to send, and the agreement pitch that shrinks next year's valley before it arrives.
Why April and October go quiet
Shoulder seasons are not a mystery. Equipment fails under load. In July a fifteen-year-old condenser runs twelve hours a day and dies; in January a heat exchanger cracks during a cold snap. In April and October nothing is under load, so almost nothing fails, and the emergency calls that fill your board all summer simply stop coming.
The part most owners miss: the demand did not disappear. The aging systems, clogged coils, and year-eleven water heaters are all still out there. What changed is the direction of the phone call. In peak season, demand calls you. In shoulder season, you have to call it. Shops that treat April as a slow inbound month have a bad April. Shops that treat it as an outbound month book it nearly full.
The gap agreements close
Before the calendar, one structural number, because it decides how deep your valleys run. A shop that lives on emergency demand routinely sees a peak-to-trough revenue swing of 60% or more - a $120,000 July followed by a $45,000 April. A shop with a strong maintenance-agreement base sees something closer to 30-40%, because hundreds of pre-scheduled tune-up visits land in exactly the months when nothing is breaking.
That is why recurring agreements now represent over half of service revenue at well-run shops, and why agreement-heavy businesses command meaningfully higher valuations when they sell: a buyer is not purchasing a logo and a truck wrap, but a list of households contractually scheduled for two visits a year. Every week in the calendar below either produces revenue this month or feeds that base.
Weeks 1 and 2 - the outbound tune-up campaign
Start with the list, not the message. Pull three segments from your customer records, in this order:
- Last season's tune-up customers. They already said yes to this exact service twelve months ago. Highest conversion, call them first.
- Owners of equipment eight years or older. Their systems are entering the failure window - an easy tune-up yes now, and a valuable inspection report later in the month.
- Past emergency-repair customers without a plan. They have felt the pain of a breakdown once. Remind them what it cost.
The benchmark to plan around: roughly 15 calls or texts to past customers per booked tune-up. The ratio holds because these people already know you. Work it backward: a two-person office making contacts for two afternoons, call it 240 touches, books about 16 tune-ups. At two visits per tech per day, that is close to a week of work for a two-truck shop, created in two afternoons.
Keep the message short and specific. A text that books: 'Hi Maria, it's Dana at [company] - we replaced your AC capacitor last June. We're doing spring tune-ups for past customers at $89 through the end of the month, and I have Tuesday or Thursday morning open. Want one?' A named person, real service history, a real price, two concrete slots. Calls follow the same shape. Do not send a newsletter; send an offer with a date on it. And text only customers who gave you their number, honoring every opt-out - texting rules carry real penalties, so treat this as operational guidance, not legal advice, and confirm your list practices with your attorney.
Week 3 - attach an agreement to every tune-up
Week 3 is when those tune-ups actually happen, and every one should end with the highest-leverage sentence in this playbook. The tech has just spent 45 minutes on the system and the homeowner has just seen the inspection photos. That is the moment to say: 'Today's visit was $89. Our plan is $16 a month - it covers this visit, the fall one, priority scheduling in July, and 15% off repairs. Want me to roll today into it?'
On maintenance agreement pricing, the working rule is simple: price the plan so the two included visits roughly break even on their own - usually $180-300 a year depending on market - and present it monthly, because $15-25 a month sells dramatically better than $250 once a year. You are not trying to profit on the visits. The plan's profit is structural: the flattened trough, first right of refusal on every repair, and a replacement pipeline, since your techs see that aging equipment twice a year.
Make the attach rate a tracked number. Shops that train a direct, in-home ask attach an agreement to a third or more of tune-ups; a brochure left on the counter converts almost none. Same customers, same price - the only difference is whether the question gets asked in the kitchen.
Week 4 - pre-book peak installs at off-season pricing
By week 4 you are holding something valuable: a stack of fresh inspection reports on aging equipment. Some of those systems will not survive the season ahead, and everyone knows it. Offer those customers a replacement quote now, with two incentives that cost you little in April and are impossible in July: off-season pricing, and their choice of install date before the rush.
The pitch is honest, which is why it works: 'This system is 14 years old and the compressor is drawing high amps. It might make it through the summer - but if it dies in July, you'll wait days for a crew and pay peak rates. Replace it in the next three weeks and it's $600 less and you pick the day.' A deposit holds the slot. Even three or four pre-booked installs turn a dead week into the best week of the quarter, and every install pulled into April frees a July crew-day for emergency work at full margin.
The work July never allows
If the calendar works, you will still have quiet hours. Spend them on the work that pays all year but never survives contact with peak season:
- A review-generation push. Text a review link to every customer from the past 90 days with one personal line about their job; a one-week push can add 20-30 reviews and lifts your local map ranking all year.
- Price-book updates. Reprice every flat-rate task against this year's equipment and labor costs. Shops that skip this quietly give away 3-5 points of margin during their busiest months.
- Tech training. Ride-alongs, manufacturer courses, and agreement-pitch practice. The week 3 attach rate is a trainable skill, and April is the only month with time to train it.
Then put the whole thing on the calendar for October, because the fall valley runs on the same physics - swap the AC tune-up for a heating tune-up and run it again. The shops that grow through shoulder seasons are not lucky with weather. They just stopped waiting for the phone.
Frequently asked questions
April and October - the gaps between heating and cooling season, when equipment is not under load and emergency call volume drops. Because they arrive on schedule every year, they are plannable: run outbound tune-up campaigns and agreement pushes in those exact windows.
Plan on roughly 15 calls or texts per booked tune-up when contacting your own past customers rather than cold lists. At that rate, a two-person office making about 240 contacts over two afternoons books around 16 tune-ups - close to a week of work for a two-truck shop.
Most residential plans land between $180 and $300 a year, priced so the two included visits roughly break even. Present it as $15-25 a month rather than an annual figure, and include priority scheduling and a repair discount. The real profit is smoother revenue, repair capture, and the replacement pipeline - not the visits.
Yes. A strong agreement base moves the peak-to-trough revenue swing from 60% or more toward 30-40%, because pre-scheduled visits land in the months when nothing breaks. Recurring agreements now exceed half of service revenue at well-run shops, and that base is a major valuation driver if you sell.