Can I mail a list I bought from a data vendor?

Yes, and the thing to check first is how the vendor sourced the roof and utility fields. Modeled data gets sold as observed data constantly. Ask what the refresh date is and which fields are inferred, then spot check twenty addresses against satellite imagery before you mail three thousand. In solar the cost of a bad row is not the wasted card, it is the qualified roof you never reached.

Does a three drop sequence mean three separate orders?

Yes, and that affects the price. Each drop is its own order, and pricing goes by order size: $1.35 per card from 200 to 999, $1.20 from 1,000 to 4,999, and $1.10 at 5,000 and up. Three drops of 500 each bill at $1.35. There is no monthly platform fee either way, so a sequence costs exactly what the cards cost.

My homeowners are 55 and up. Will they actually scan a QR code?

Some will, and the rest phone you. The QR code exists for attribution, not as the only door in. Every card carries its own code tied to the address it went to, so a scan names the house. Print the phone number at the same size as the code and let the homeowner choose, because a 62 year old with a $340 power bill is a better prospect than a 30 year old renter who scans everything.

Is 500 pieces enough to judge the channel?

Not on its own. At the 1.89% tracked average, 500 cards produce nine or ten responses, which is a thin sample to draw a conclusion from. One quiet drop tells you more about variance than about the list. Run the full sequence, or mail 1,000 or more, before you decide. The QR and delivery data are what make the second campaign smarter than the first.

Solar Direct Mail: The Channel Your Competitors Aren't Using Yet

Why is every solar company fighting over the same three channels?

Door-to-door. Google Ads. Facebook Ads.

That's the solar marketing playbook for 95% of installers. And it shows in the numbers:

Google Ads: $206 to $1,929 per lead depending on state
Customer acquisition cost: $2,580 per install
Door-to-door: High burnout, declining effectiveness, increasing regulations

Meanwhile, there's a channel that delivers qualified solar leads for $67 each. Almost nobody in solar is using it.

Why is direct mail solar's untapped channel?

Direct mail has a reputation problem. People associate it with ValPak coupon books and "Current Resident" junk mail.

That's exactly why it works.

The mailbox is empty. The inbox has 121 emails. Google has 10 ads above the fold. Facebook is a scroll-fest of sponsored content. But the physical mailbox? Maybe 2-3 pieces of meaningful mail per week.

When a handwritten postcard shows up from a local solar installer, with the homeowner's name, their specific address, and a concrete savings estimate, it gets read.

Across 16,434 postcards in our split test, handwritten pen-and-ink cards pulled a 2.16% response rate. Standard printed postcards pulled 0.40%. That's 5.4x higher.

For solar, where one closed deal is worth $25,000 to $40,000, that difference in response rate changes everything.

What makes direct mail structurally different?

Here's what makes direct mail different from every digital channel:

No bidding wars. Google Ads is an auction. When more solar companies bid on "solar installation [city]," the price goes up. Direct mail costs the same whether you're the only solar company mailing or one of fifty.

Pre-intent targeting. Google Ads catches people who are already searching. By then, they're comparing three installers. Direct mail reaches homeowners before they start searching. You're the only voice in the conversation.

Physical permanence. A Google Ad disappears when they scroll past it. A postcard sits on the kitchen counter for days. The homeowner sees it multiple times. Their spouse sees it. It becomes a conversation starter.

Trust signal. A handwritten card in real pen and ink communicates something a digital ad never can: "Someone took the time to write to me personally." That perception, whether conscious or not, changes the response dynamic.

What does a solar direct mail campaign look like?

Step 1: Build a targeted list

Don't mail every homeowner. Target the ones with buying signals:

High utility rates ($0.15+/kWh)
Roof age 5-20 years
Property value $300K+
No existing solar permits
Bonus signals: EV owner, recent HVAC, homeowner tenure 5+ years

500 highly targeted homeowners is more valuable than 5,000 random addresses.

Step 2: Write a message that sounds human

"Hi [Name], I install solar systems in [neighborhood] and noticed your home at [address] could be a great fit. With the 30% federal tax credit and your current utility rates, most homeowners here save $1,800-$2,400/year. I put together a quick savings estimate for your property. [Your Name]"

No logos. No "CALL NOW!" No corporate speak. Just one person talking to another about something relevant to their home.

Step 3: Send handwritten, not printed

The 5.4x response rate difference between handwritten and printed isn't marginal. On 500 cards, that's the difference between 2 responses and 11 responses.

At $1.35 per card through Mailbots, a 500-piece campaign costs $675. With 11 responses at a 25% close rate, that's 2-3 installs from a $675 investment.

Step 4: Multi-drop sequence

One postcard is a suggestion. Three postcards is a presence.

Drop 1 (Week 1): Savings estimate + tax credit urgency Drop 2 (Week 3): Social proof. "I just installed for your neighbor at [nearby street]" Drop 3 (Week 5): Final follow-up. "Still happy to put together your estimate"

Total: 500 homes x 3 drops x $1.35 = $2,025

Step 5: Track everything

Per-piece QR codes tell you exactly which card drove which response. USPS delivery tracking tells you when each piece hit the mailbox. No more "mail and pray."

The Numbers Your CFO Wants to See

Metric	Google Ads	Handwritten Direct Mail
Cost per lead	$206-$1,929	$67-$122
Response rate	2-4% CTR, varies	1.89% average (0.98-4.39% range)
Lead quality	Comparing 3+ installers	Often only installer contacted
CAC	$2,580	$675-$1,000
Attribution	Click tracking	Per-piece QR + delivery tracking
Competition	Every solar company	Almost nobody

The ROI story for solar direct mail isn't complicated. Lower cost per lead, higher lead quality, zero competition in the channel.

Why now?

Two things are happening simultaneously:

The tax credit sunset created genuine urgency. Homeowners who've been "thinking about it" now have a deadline. Your message has a built-in reason to act.
Digital ad costs keep climbing. Every year, Google Ads gets more expensive as more solar companies compete for the same keywords. Direct mail costs are stable.

The window is open. Your competitors are dumping their budgets into Google Ads. The mailbox is empty.

Launch your first solar direct mail campaign at mailbots.ai. 200 handwritten postcards for $270. Per-piece tracking, QR attribution, no platform fees.