HVAC
The HVAC playbook for the first heat wave of the year
Get ready in spring, not the week of. Sell tune-ups early so weak systems get fixed on your schedule, stock capacitors, contactors and condenser fan motors, hold two same-day slots open every day, and set your triage order in advance: vulnerable people in dangerous heat first, then plan members, then everyone else, each with a realistic arrival window.
Every AC that limped through last summer is waiting for the first weekend in the 90s. When it arrives, those systems quit together, usually on a Saturday afternoon with your techs already spread thin. The shops that handle it well don't work any harder that weekend than you do. They did their prep in March, April and May.
Why the first heat wave hits harder than the rest
Midsummer heat gets the attention, but the first real hot spell is often the worst stretch for calls. Equipment that hasn't run hard since last September gets pushed to full load all at once. A capacitor that was already weak, a contactor with pitted points, a fan motor with dry bearings: each one was fine at 75 degrees and gives out at 95. Homeowners haven't adjusted yet either. They set the thermostat to 70, the system runs flat out from noon to midnight, and anything marginal gives up.
By August, most of the weak units have been repaired or replaced. That's why the first wave packs so many of the same failures into a few days, and why most of the fixes are small parts you can carry on the truck.
The spring timeline
| When | What to do | Why it pays off |
|---|---|---|
| Early spring | Start booking cooling tune-ups, members first | You find weak parts while there's time to replace them |
| A month later | Order summer truck stock and ask your supply house about lead times | Parts get scarce when every shop reorders the same week |
| A few weeks out | Write the triage order and phone wording; brief everyone who answers | Nobody invents policy at 4 p.m. on a Saturday |
| When the forecast turns | Confirm on-call coverage, top off trucks, start holding slots | You enter the rush with room left on the board |
Timing depends on your climate. In hot markets the whole calendar moves earlier.
Sell tune-ups before it's hot
Every system you check in April is one less surprise in July. A tune-up is the cheapest place to catch a capacitor reading well under its rating or a contactor that's burned. Replace it on a calm weekday, bill it as a normal repair, and that house never becomes a Saturday emergency.
The trap is pricing tune-ups so low that they only work if the tech sells hard on every visit. That tradeoff is laid out in whether cheap tune-up specials are worth it. The steadier long game is a plan with two visits a year, and the maintenance agreement math shows how that fills your spring and fall.
Stock the parts that fail in heat
- Run capacitors. Dual-run caps in the sizes you see most on local equipment, plus a few universal ones. On a hot day these are the most common no-cool fix.
- Contactors. Single and double pole with 24-volt coils. Pitting and ants take them out, and they're a quick swap.
- Condenser fan motors. A couple of universal multi-horsepower motors, the mounting hardware, and a matching capacitor for each.
- Hard-start kits. For older compressors that struggle to start against high head pressure.
- Condensate supplies. Float switches, a spare pump, drain fittings and pan tablets. Humid heat fills pans fast.
- Disconnect fuses. Blown fuses at the outdoor disconnect are common, and the one size you didn't carry costs a trip.
If your records show what you used last summer, stock at least that much plus some cushion. A second trip for a part during the rush costs you a whole call you could have run instead.
Hold two same-day slots every day
Owners resist this one, because on quiet days it looks like leaving money on the table. Do it anyway. Two open slots, held until early afternoon, give you room for the older caller whose living room is at 94, the plan member, or the rental with a tenant and a new baby.
Example numbers
A two-tech shop might run about 5 repair calls per tech on a heat wave day, so roughly 10 calls in total. Holding 2 means 8 slots get booked in advance and 2 stay flexible.
If nobody urgent calls by 1 p.m., release the held slots to the next people on the waiting list. On a slow day you've lost nothing, and on a wild one you keep your promises.
Set the triage order now
Decide the order before the phone starts, and post it where anyone answering can see it.
- Dangerous heat and vulnerable people. Older adults, babies, anyone with a health condition, or a home that's already very hot inside. If a caller sounds confused or sick from the heat, tell them to call 911 first.
- Plan members. They paid for priority. Honor it or the renewals stop coming.
- Everyone else, in the order they called. Each one gets a real window, not the one you wish you could hit.
For juggling the board once volume triples, see running the HVAC schedule during a heat wave.
Give honest windows, not hopeful ones
On a heat wave day, a 2 to 4 window that turns into 7 p.m. costs you more than the job pays. The customer sat in a hot house, rearranged their day, and now they're writing a review. Pad your drive times, assume calls run long, and tell people the truth.
CallerCan someone come today? It's 88 in here.
YouToday's full, and I'd rather not promise a time we'll miss. The earliest I can count on is tomorrow between 8 and 11. Until then, close the blinds on the sunny side, run fans, and keep everyone in the coolest room. If anyone starts feeling sick from the heat, call 911.
Most people take an honest tomorrow over a vague maybe-tonight. If a cancellation lets you squeeze them in sooner, that's a pleasant surprise instead of a broken promise.
Plan for a phone that won't stop
Every call nobody answers on that first hot Saturday is a job another shop books. Your techs are on roofs and in attics, and whoever usually handles the phone can't keep up. Decide now who picks up, what they say about price, and what happens to calls after hours. On a 95 degree day, a caller who reaches voicemail just dials the next listing. The cost of a single missed call multiplies quickly in a week like this.
Common questions
How many same-day slots should an HVAC shop hold during a heat wave?
Two a day is a sensible starting point for a small shop, adjusted to how many techs you run. A bigger crew might hold one per tech. The goal is room for truly urgent calls without leaving the board half empty. If nobody urgent has called by early afternoon, release the held slots to the next people waiting.
What should customers do while they wait for AC repair?
Close blinds and curtains on sun-facing windows, run fans, spend time in the lowest and coolest room, and drink water. If the system is running but only blowing warm air, turning it off can let a frozen coil thaw and keep a struggling part from failing worse. Anyone showing signs of heat illness needs 911, not an HVAC visit.
Should maintenance plan members always go first?
Members should jump ahead of regular callers, since priority is one reason they signed up. But a non-member with an infant or an elderly parent in a dangerously hot house should still come before a member whose upstairs is merely uncomfortable. Life safety first, members second, then everyone else in order.
When should HVAC companies start booking spring tune-ups?
As soon as heating season winds down, which is late winter or early spring in many climates. The earlier the visits happen, the more weak parts you replace before the first hot spell. Once the forecast reaches the 90s, those hours are usually better spent on no-cool repairs than on routine checks.