Every furnace and AC you've ever serviced is a customer who already trusts you. PostKnock mails reactivation postcards to your past tune-up, repair, and install list — then drops each one into a call queue so your office follows up before the season hits.
Start Free — No Credit CardFree plan from $1.05/card · Pro from $0.79/card · No contracts
"Lapsed" isn't one problem — it's several. Each one is a homeowner whose system you already know, who quietly stopped calling. Reactivation postcards plus a phone call are how you get back on their list before they Google a competitor at 95°.
Customers who got one spring AC or fall furnace tune-up and never came back the next year. The maintenance list bleeds a little every season it isn't worked.
You fixed their AC two summers ago, did good work, and then… nothing. They never booked maintenance and don't think of you until something else breaks.
A service agreement that auto-expired or was cancelled and never renewed. That recurring revenue walks out the door the month the plan lapses.
Past customers running 12–15+ year-old units headed for failure. Reach them before the breakdown and you win the replacement; miss them and a competitor does.
You're slammed in July and dead in October. Reactivating past customers in the shoulder seasons smooths out the slow weeks and pre-books the rush.
A house you've serviced changes hands and the new owner has no idea who maintains the system. A postcard to the address re-establishes you as their HVAC company.
Email blasts to old customers get ignored. A reactivation postcard physically lands in the mailbox — then, a few days later, a familiar voice from your office closes the loop and books the truck roll. That one-two punch is what PostKnock is built for.
A multi-touch wave sequence built for past HVAC customers, timed to the season. Postcards mail on schedule; non-responders flow into the Call Queue and roll forward to the next wave automatically.
Warm, personal tone with the customer's name auto-filled. One seasonal offer (spring AC tune-up, fall furnace check, or "let's get your system ready"). QR code to online scheduling.
3–5 days after the card lands, the customer appears in your Call Queue with a pre-loaded script: "We serviced your system a while back — we've got tune-up slots open before it gets hot." Staff logs the outcome in one click.
A different design for everyone who hasn't booked. Lead with a maintenance-plan offer, a "before the heat wave / cold snap" deadline, or a financing nudge for customers on aging systems.
Last call attempt for non-responders, paired with a low-key reintroduction postcard. Then the segment rests until the next season, when you recycle it for the opposite system.
Wave count, timing, and call cadence are yours to set — PostKnock supports up to 5 waves. The phone-call waves use the built-in Call Queue, a Pro feature.
A reactivation card needs a reason to call back now. These are common, customer-appropriate angles you can drop into the postcard offer field — pick what fits the season and the customer's system.
Offers are illustrative. You set the offer copy; PostKnock prints and mails the card and queues the follow-up call. Check your state's advertising and rebate rules.
HVAC reactivation lives and dies by timing. The win is reaching past customers in the shoulder weeks — before the rush, while crews still have open slots. Mail ahead of the season, not during it.
Mail AC tune-up reactivation cards in late February through April, before the first heat wave floods your phones. Reach last year's tune-up customers who never rebooked.
Mail furnace check reactivation cards in late August through October, ahead of the first cold snap. Same list, opposite system — recycle the segment with a new offer.
PostKnock playbooks let you schedule waves so the cards arrive in the shoulder window and the follow-up calls land while there's still room on the schedule. Run the same list twice a year — AC in spring, heat in fall.
Design it in the in-app Design Studio in your company's colors. Four starting styles — same offer and same call follow-up behind each, so pick the look that fits your brand.
Bold
Photo
Minimal
Gradient
Front Detail
Back (Address Side)
Available in 4×6, 6×9, and 6×11. All-in pricing includes printing and USPS First-Class postage.
In ServiceTitan, Housecall Pro, Jobber, FieldEdge, or any system — run a report for customers with no job in the last 12–24 months (or your own cutoff) and export it as a CSV. PostKnock doesn't connect to your software; you export the file, then import it.
Drop in the export and the import wizard auto-maps name, address, phone, and last-service columns. Segment AC vs. furnace, maintenance-plan lapses, or aging-system customers if you want different offers per group.
Choose the wave sequence, set your seasonal offer, and design the postcard in the Design Studio. Add a QR code that points to your online scheduler so homeowners can self-book a tune-up.
Cards print and ship via USPS First-Class automatically. A few days after delivery, every customer who hasn't booked drops into the Call Queue. Non-responders advance to the next wave on their own.
Staff calls down the queue with the pre-loaded script and logs each outcome. QR scans are tracked so you can see which cards drove online bookings versus calls.
Say an HVAC company pulls 500 lapsed customers (no job in 12+ months) and runs a 3-wave reactivation sequence with call follow-up ahead of cooling season. Here's the transparent math — the inputs are illustrative, not a guarantee:
Response and reactivation rates are industry-typical ranges, not PostKnock results. Per-customer value depends on your ticket sizes and how many become repeat or replacement jobs. Add a Pro subscription ($99/mo) on top of per-piece cost if you want the Call Queue and multi-wave sequencing.
Free to explore — you only pay when you're ready to send. Pay from your wallet per piece.
Single-wave postcard campaigns · Design Studio · QR tracking · From $1.05/piece
Everything in Free + Call Queue & multi-wave sequencing · From $0.79/piece
Per-piece pricing includes printing + USPS First-Class postage. Pro is $99/mo or $799/yr. No setup fees, no minimums, no contracts.
Most HVAC companies treat a customer as lapsed once they've gone a full season or year without booking — commonly 12+ months since their last tune-up, repair, or service — or once a maintenance plan expires and isn't renewed. You set the cutoff when you pull the list from your field-service software; PostKnock just mails to whoever is on your CSV.
Time it to the season, not the calendar. Mail AC tune-up reactivation cards in late winter through spring before the first heat wave, and furnace check cards in late summer through fall before the first cold snap. The goal is reaching past customers in the shoulder weeks while your crews still have open slots — you can run the same list twice a year for the opposite system.
Yes. ServiceTitan, Housecall Pro, Jobber, FieldEdge and most other field-service systems let you run a customer or inactive-customer report and export it as a CSV. Filter by last service date to find customers lapsed 12+ months, then import the CSV into PostKnock — the wizard auto-maps name, address, phone, and last-service columns. PostKnock does not integrate directly with your software; you export the file and import it.
One clear, seasonal offer with a reason to act now works best: a discounted spring AC or fall furnace tune-up, a maintenance-plan reinstatement with no enrollment fee, or a free replacement estimate for customers on aging systems. Customers who only ever had a one-time repair tend to respond to a "let's keep it running" maintenance offer. Always check your state's advertising and rebate rules — you write the offer copy, PostKnock prints and mails it.
Most HVAC companies run 3 to 4 waves over several weeks, mixing postcards with one or two call attempts for non-responders. PostKnock supports multi-touch wave sequences of up to 5 waves; you control the timing and which waves are postcards versus calls. A single touch rarely rebooks the job — the follow-up call is what closes it.
You can mail postcards on the Free plan with no calls at all. The built-in Call Queue — which puts each lapsed customer in front of your office staff with a pre-loaded script after the card lands — is a Pro feature. For reactivation specifically, the call is usually what turns a postcard into a booked truck roll, so most HVAC companies use it.
Past customers running aging equipment respond best to a specific, higher-value offer — a free in-home replacement estimate, an efficiency check, or a financing or seasonal-rebate reminder — rather than a generic greeting. Pair it with a wave sequence and a follow-up call so you reach them before the system fails and they call a competitor in a panic. Industry studies typically report direct-mail response in the low-single-digit-percent range on a house list.
You pay per piece from your wallet: from $1.05 per 4×6 card on the Free plan, dropping to $0.79 on Pro, with printing and USPS First-Class postage included. Pro is $99/mo (or $799/yr) and adds the Call Queue and multi-wave sequencing. No setup fees, no minimums, no contracts — you only pay for what you send.
Yes. PostKnock supports 50+ industries with pre-built playbooks — including plumbing, roofing, pest control, lawn care, and more. The reactivation playbook works the same way across trades: import a CSV of past customers, mail a designed postcard with a seasonal offer, and follow up by phone on Pro. See the all-industries reactivation page for the cross-vertical version.
Postcards that get attention. Callbacks that close the deal. Start free — you only pay when you send.
Start Free — No Credit Card1 Response and reactivation figures are industry-typical ranges, not PostKnock results. House-list direct-mail response is commonly reported in the low-single-digit-to-high-single-digit percent range — e.g. ANA (Association of National Advertisers), Response Rate Report. Your results depend on your list, offer, season, and follow-up.
2 PostKnock supports three postcard sizes (4×6, 6×9, 6×11) and multi-touch wave sequences of up to 5 waves.