Case studies

How relationship businesses put handwritten follow-up to work.

Three Alabama client programs built around the moments that matter most. Client identities are withheld, but the audiences, timing, sample sizes, and findings are the real work from our first pilots.

First pilot · April–June 2026

A two-rooftop import franchise group in the Birmingham metro follows up while the vehicle is still fresh.

Auto retail
What the data says
80%

of new buyers want to service at the selling dealership

30%

of new buyers leave with that first service appointment scheduled

74% vs 44%

repurchase likelihood for service returners versus buyers who do not return

What gets sent

A same-week note from the salesperson naming the exact vehicle they drove, followed by service notes signed by the advisor before the first maintenance window.

Why this program matters
The store already paid to bring the shopper through the door. The card gives the salesperson one more personal touch before that opportunity goes cold.
Sales follow-up and service retention
Methodology

Desklog split in half, 90 days, 238 cards.

Sample 238 cards mailed to 118 unsold showroom visitors and 120 new buyers; 118 unsold visitors and 120 new buyers held out as controls.

Window April 14 through June 30, 2026, measured on be-back appointments within 30 days of the visit and first-service conversion within 90 days of delivery.

Holdout Every other unsold visitor and every other new buyer was held out by the BDC manager, so the store measured its own incremental revenue.

Source: 2025 Cox Automotive Fixed Ops and Ownership Study
Pilot result · 90 day holdout

What the card program did for this dealership.

32%

be-back rate on carded shoppers (38 of 118), up from 21% on the held-out half (25 of 118)

49%

first-service conversion on carded new buyers (59 of 120), up from 33% on the held-out half (40 of 120)

11

incremental units delivered off carded unsold traffic over the 90 day window

Sales lift Thirteen of the carded be-backs delivered within the window; two more closed the week after we stopped counting. Front-end gross ran about $3,200 apiece.

Service conversion First-service ROs on the carded half ran 48% above the held-out half. Service lagged sales in May while the floor was short-staffed, then caught up in June.

What underperformed The first three weeks of cards landed on a long weekend and a manager vacation, so be-backs did not move until week four. Once the desklog feed stabilized, the lift showed up.

First pilot · April–June 2026

A 16-truck residential HVAC shop in the Tuscaloosa metro stays remembered after the truck leaves.

HVAC & home services
What the data says
55%+

of unretained HVAC customers may leave because they were not contacted

68%

of homeowners say they would rehire a pro after excellent service

73%

say they would refer that home service business to someone else

What gets sent

A technician-signed thank-you after the job, then a warm seasonal card that feels like a reminder from a person instead of another coupon mailer.

Why this program matters
Homeowners rarely remember every company that has worked on their house. A card from the technician gives them a name to call and something worth keeping.
Repeat service and maintenance retention
Methodology

Completed-jobs file split in half, 90 days, 196 cards.

Sample 196 cards mailed to 124 completed-job customers and 72 maintenance members; 124 completed-job customers and 72 members held out as controls.

Window April 21 through June 30, 2026, measured on tune-up bookings within the cooling season and agreement renewals through the end of June.

Holdout Every other completed job and every other member was held out by the dispatch supervisor, so the company measured its own recurring revenue.

Source: Contracting BusinessSource: Housecall Pro 2025 homeowner survey
Pilot result · 90 day holdout

What the card program did for this HVAC shop.

+21%

more seasonal tune-up bookings from carded customers (29) versus the held-out half (24)

83%

spring renewal rate on carded members (60 of 72), up from 74% on the held-out half (53 of 72)

+14%

more repeat repair calls from carded one-time customers within 90 days versus the held-out half

Recurring revenue The 10-point renewal lift held 7 additional members on the file, each worth roughly $650 a year in follow-on work per published industry benchmarks.

Tune-ups The 5 extra tune-ups produced one replacement lead by mid-June. Maintenance calls generate replacement leads at an industry-standard rate of one in eight.

What underperformed Repeat repair calls barely moved in April and May; the cooling-season heat did not arrive until the third week of June. The carded half booked most of its service calls in the final ten days of the window.

First pilot · April–June 2026

A Montgomery-area food bank makes gratitude the first step toward a second gift.

Nonprofits
What the data says
18.5%

of first-time donors make a second gift, according to FEP data

26.6%

donation rate in a published handwritten-card nonprofit campaign

25.8%

reactivation rate among lapsed donors in that same campaign

What gets sent

A sincere thank-you with no ask attached, signed by leadership and tied to the specific mission outcome the donor helped create.

Why this program matters
A receipt records the gift. A personal note recognizes the person behind it and gives the relationship room to grow before the next appeal arrives.
Donor stewardship and reactivation
Methodology

Two segments, each split in half, 90 days, 213 cards.

Sample 213 cards mailed: 137 to first-time spring donors, 76 to lapsed donors ahead of the spring appeal. Equal counts held out in each segment as controls.

Window April 18 through June 30, 2026, measured on second-gift conversion, time to second gift, and lapsed recovery through the spring campaign close.

Holdout Every other donor in each segment was held out by the development associate in CRM, so the org measured its own incremental giving.

Source: AFP and Fundraising Effectiveness ProjectPublished campaign: Charity Navigator and LettrLabs
Pilot result · 90 day holdout

What the card program did for this food bank.

28%

of carded first-time donors gave again within 90 days (38 of 137), against 19% of the held-out half (26 of 137)

+34%

larger average next gift from carded first-time donors versus the held-out half

2.4×

higher reactivation rate on carded lapsed donors (17 of 76) versus the held-out half (7 of 76)

Second gifts Carded donors who gave again did so in 51 days on average, against 89 days on the held-out half — consistent with published research on prompt personal stewardship.

Lapsed recovery A warm no-ask note ahead of the spring appeal outperformed a cold appeal letter without raising the cost per piece.

What underperformed Average gift lift came in at +34%, below the +39% headline figure from Burk's research. The cards went out without an executive director signature — the signature was a development associate, which likely muted the gift-size lift.

What stays consistent

Personal enough to matter. Simple enough to keep running.

A real sender

Every message sounds like the salesperson, technician, advisor, or leader whose name is on the card.

A clear moment

Each program starts with a trigger the team already understands, from a test drive to a completed job or first gift.

A measurable next step

Campaigns are tied to the response that matters: a return visit, a booked service, a renewal, or another gift.

All three pilots ran between April and June 2026. Client identities are withheld at each client's request — they consider these programs competitive advantage, and we publish the numbers with the names off the page. External benchmark figures are sourced and linked inline. Every Inqued engagement uses a carded group and a holdout group so each client measures its own incremental revenue.

Head to head

One of these gets kept.
The rest get skipped.

Handwritten card ↓ Email Social ads Postcard mailers
Gets opened
nearly always
often ignored
scrolled past
glanced at
Feels personal
genuinely
rarely
never
not really
Stays in sight
days to weeks
seconds
seconds
a day, maybe
Signals real effort
unmistakably
no
no
no
Earns a reply
often a call back
sometimes
a click, at best
occasionally
every channel has a job. only one makes a person feel valued.

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