If I'm timing a campaign to a deadline, how do I know when the cards landed?

Per-piece USPS delivery tracking gives you a scan date on every card rather than one date for the whole batch. You watch the drop land street by street, which matters when the message on the card references a date. It also tells you your real transit time, so the second and third drops get scheduled from measured data instead of a guess.

The playbook says three drops of 500. Is that one order or three?

Three orders, and that decides the price. 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 separate 500 card drops bill at $1.35 each, which is the $2,025 above. Ordering all 1,500 at once prices at $1.20, but then everything lands the same week and there is no sequence.

Can I mail the same list three times, or do I need a fresh one each drop?

Mailing the same list is the point of a sequence. Pull the addresses that already responded before the next drop, so drop two goes only to people who have not raised a hand, and drop three only to the ones who ignored both. That suppression is what keeps a three touch sequence from reading as three copies of the same card to someone already talking to your sales rep.

What do I actually get for $1.35 a card?

Real pen and ink on both sides, written by a robotic pen rather than printed in a handwriting font. That is the whole product, and it is why the card gets read at all. Everything else in the price is the plumbing that gets it to the right roof and tells you when it arrived, with no software subscription layered on top of the per-card cost.

Solar Marketing in 2026: Why the Tax Credit Sunset Changes Everything

The Clock Is Ticking on Solar's Biggest Sales Tool

The federal residential solar credit changed after December 31, 2025. Confirm the current rules with your CPA or the IRS before you build a campaign around them, because the details have moved more than once and a mailer that misstates them is worse than no mailer. What has not changed is the effect on your pipeline: every homeowner who has been "thinking about it" now has a reason to decide.

For solar installers, this is the most powerful marketing window in a decade.

But here's the thing most solar companies are getting wrong: they're spending the urgency budget on the same Google Ads that already cost $206 to $1,929 per lead depending on the state. California installers are paying nearly $2,000 per lead through paid search. That's insane when you think about the math.

Why does the tax credit sunset favor direct mail?

Urgency sells. Everyone in marketing knows this. But urgency only works when the person actually sees your message.

The average American gets 121 emails a day. They see 6,000 to 10,000 digital ads. They get maybe 2-3 pieces of meaningful mail per week.

When you send a handwritten postcard that says "Federal solar incentives changed this year. Here's what that means for your home at [address]," that card gets read. Not skimmed. Read.

Our split test data across 16,434 postcards showed pen-and-ink postcards pulled a 2.16% response rate versus 0.40% for standard printed mail. That's 5.4x higher.

On a $25,000 to $40,000 solar installation, you need that one response to make your entire campaign profitable.

How does the math compare to Google Ads?

Let's run the numbers side by side.

Google Ads (national average):

Cost per lead: $206 to $1,929
Customer acquisition cost (CAC): $2,580 per install ($0.43/watt)
Close rate on paid leads: 15-25%

Handwritten direct mail:

Cost per card: $1.35 (200-999 pieces) through Mailbots
Response rate: 1.89% average (our tracked campaigns range from 0.98% to 4.39%)
Cost per lead: ~$67-$122
Close rate on warm inbound: 25-40%

At $67 per lead versus $1,929 in California, you're looking at 28x cheaper lead generation. Even against the national average of $206, direct mail comes in at a third of the cost.

And the lead quality is different. Someone who responds to a personalized postcard is a warmer lead than someone who clicked an ad while comparing three installers.

What urgency message actually works?

Generic urgency is noise. "Act now!" means nothing. Specific urgency converts.

Here's what works for the tax credit sunset:

Be specific about the money, but only about numbers you can stand behind: "Federal solar incentives changed this year. On a typical $32,000 installation the difference is worth a conversation before you decide. Your home at [address] is a strong candidate based on roof orientation and utility rates."

Do not print a specific credit percentage, dollar amount or deadline on a card unless you have verified it against current IRS guidance that week. A homeowner who acts on a number you got wrong has a real grievance, and you are the one who mailed it to them.

Personalize the property: Mention their address. Reference their utility provider if you can. The more specific, the more real it feels.

Give them one clear action: Don't list your website, phone, email, and QR code. Pick one. A QR code with per-piece tracking lets you know exactly which card drove which response.

Which homeowner segments should you target?

Not every homeowner is a solar prospect. Here's who to mail, ranked by conversion likelihood:

High electric bills. Homeowners in areas with utility rates above $0.15/kWh. They have the clearest financial motivation.
New roof owners. If they just replaced their roof in the last 2 years, the "I don't want to mess with my roof" objection is gone.
EV purchasers. Tesla and EV owners already buy into the ecosystem. Their electric bills just went up. Solar is the logical next step.
HVAC replacement. Homeowners who just dropped $8,000 on a new HVAC system are thinking about energy costs. They're primed.
High property value, older homes. Homes valued $400K+ with 15+ year old roofs. They can afford it and the roof is aging anyway.

You can get these lists from data providers who cross-reference utility data, permit records, and property characteristics.

What does the campaign look like?

Week 1-2: First drop Mail 500 handwritten postcards to your best segment (high electric bills + good roof age). Use the tax credit urgency angle. Include a QR code linking to a personalized landing page.

Week 4: Second drop Mail the same list again. Different message, same urgency. "Following up on your solar estimate. Wanted to make sure you saw the savings estimate for [address]."

Week 6: Third drop Final touch. "One more before the season fills up. I put together a quick estimate for your property. Scan here to see it."

80% of sales happen after the 5th contact. Three touches by mail puts you ahead of every competitor sending one postcard and giving up.

Budget: 500 cards x 3 drops x $1.35 = $2,025 total campaign cost.

At a 1.89% response rate across 1,500 total impressions, you're looking at roughly 28 responses. If you close 25% of those into $32,000 installs, that's 7 installs from a $2,025 investment.

The gross margin on solar installs runs $6-$8 for every $1 spent on leads according to SolarReviews data. This campaign math works.

Speed Matters More Than You Think

Here's a stat that should change how you handle responses: contacting a solar lead within 1 minute boosts conversion by 400%.

That means your direct mail campaign needs a fast response system. When someone scans that QR code at 7 PM on a Tuesday, you need to call them back immediately, not the next morning.

Set up your QR codes to trigger an instant notification. Mailbots' per-piece tracking and QR attribution tells you exactly who responded and when.

Stop Competing on Google Ads

The solar tax credit sunset is a once-in-a-generation urgency event. Every solar company in your market is going to bid up Google Ads trying to capitalize on it. That's going to push lead costs even higher than $2,580 per install.

Meanwhile, the mailbox is empty.

Handwritten postcards at $1.35 each, pulling 5.4x higher response rates than printed mail, with per-piece delivery tracking and QR attribution.

That's not a marketing experiment. That's a math problem with a clear answer.

Start your solar direct mail campaign at mailbots.ai. 200 handwritten postcards for $270. No platform fees, no contracts.