I stacked all three layers and ended up with 340 addresses. Is that too small to mail?

No. The minimum order is 200 cards, so 340 works, and at $1.35 each that drop runs $459. A tight list of 340 qualified roofs usually beats 3,000 addresses picked on zip code alone. Be honest about the sample size though. At the 1.89% average, 340 cards means six or seven responses, so run the sequence instead of judging the list on one drop.

Can I upload the list I already pulled from the county?

Yes, that is the normal path, and county data is usually better than what a vendor resells you because it is the source. What it will not have is roof orientation or utility territory, so plan on joining it against satellite imagery and a rate map yourself. Budget an evening for the join. It is the least glamorous hour in solar marketing and the one that decides your cost per lead.

Will you filter out homes that already have panels?

No, and that filter belongs in your list build. Nothing in the mail pipeline can see a roof. Pull existing solar permits from the county or your data provider and suppress those records before you upload. It is the cheapest filter in the stack and the one installers most often skip, right up until a homeowner calls to say they went solar two years ago and would you like to see the bill.

Is there a monthly fee for the tracking?

No. The attribution and the delivery data are inside the per-card price, and there is no monthly platform fee. Cards run $1.35 each from 200 to 999, $1.20 from 1,000 to 4,999, and $1.10 at 5,000 and up. Platforms that sell the tracking layer as software charge $199 to $550 a month before a single card goes out, which is a lead and a half in most markets.

The Solar Installer's Guide to Targeting Qualified Homeowners (Without Google Ads)

Google Ads Is a Tax on Lazy Solar Marketing

The average solar company spends $2,580 to acquire a single customer through paid search. That's $0.43 per watt just on marketing.

Google Ads works. Nobody's arguing that. But it's an auction, and when every solar installer in your market is bidding on the same keywords, the price only goes one direction: up.

In California, a single Google Ads lead runs up to $1,929. Even in cheaper markets, you're looking at $206 per lead minimum.

There's a better way to find qualified homeowners. It doesn't involve bidding wars, and it doesn't require a $10,000/month ad budget.

Where should the targeting actually start?

Google Ads finds people who are searching for solar. That's valuable, but it's also expensive because every competitor is fighting for those same searches.

Direct mail lets you find people who should be searching for solar but haven't started yet. Pre-intent. Before they've talked to your competitors.

Here's how to build that list:

Layer 1: Property Characteristics

Pull property records for your service area. You're looking for:

Roof age 5-20 years. New enough for panels, old enough the owner isn't precious about it
South or west-facing primary roof. Maximum solar production
Property value $300K+. Can afford the install and qualify for financing
Single-family detached. Easier permits, no HOA solar restrictions (usually)

County assessor data gives you most of this. Data providers like ATTOM, CoreLogic, or DataTree can deliver it cleaned and formatted.

Layer 2: Utility and Energy Signals

Stack energy signals on top of property data:

High utility rate zip codes. Areas where electricity costs exceed $0.15/kWh
No existing solar permits. Don't mail people who already have panels
Recent HVAC permits. Just spent $8K-$15K on climate control, thinking about energy costs
EV registrations. Tesla owners in particular. Their electric bill just went up, and they're already in the ecosystem.

Layer 3: Financial and Life Signals

Homeowner tenure 3+ years. They're settled in, planning to stay
No recent sale activity. Not about to move
Age 35-65. Prime solar buying demographic
High credit indicators. Can qualify for $0-down solar financing

When you stack two or three of these layers, you get a list of homeowners who are genuinely good solar candidates. Not people who typed "solar panels" into Google. People whose houses, finances, and energy usage make solar a no-brainer.

Why does handwritten mail convert this list better?

You've built a great list. Now the delivery vehicle matters.

A glossy printed postcard from "SunPower Solar LLC" looks like junk mail. It gets the same treatment as every other piece of marketing that arrives in the mailbox, 2.5 seconds of attention before the recycling bin.

A handwritten postcard in real pen and ink gets opened. Read. Considered.

Split test data across 16,434 postcards: handwritten pen-and-ink pulled 2.16% response versus 0.40% for standard printed. That's 5.4x higher.

On a targeted solar list where the homeowner actually is a good candidate, response rates push even higher. Our tracked campaigns range from 0.98% to 4.39%.

What do you write to a homeowner who isn't shopping yet?

These homeowners aren't shopping for solar yet. Your message needs to do two things: create awareness of the opportunity and give them a reason to act now.

What works:

"Hi [Name], I've been installing solar systems in [neighborhood] and noticed your home at [address] has great roof orientation for panels. With the federal tax credit still at 30%, most homeowners here save $1,800-$2,400/year. I put together a quick estimate for your property. Scan the code to see it. [Your name]"

Why this works:

References their specific property, not generic
Mentions the neighborhood, social proof that neighbors are going solar
Cites specific savings, not "save money," but "$1,800-$2,400/year"
Tax credit urgency: a deadline creates reason to act now
QR code: one clear action, trackable per piece

What doesn't work:

"GO SOLAR TODAY! Call for a FREE quote!" This is noise.
Long paragraphs about your company history. Nobody cares.
Multiple CTAs (call, email, visit website, text). Pick one.

How many drops does the sequence need?

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

80% of sales happen after the 5th contact. Most solar companies send one mailer and quit. That's why their response rates are garbage.

Drop 1 (Week 1): Introduction + savings estimate + tax credit urgency Drop 2 (Week 3): Different angle: neighbor installations, environmental impact, property value increase Drop 3 (Week 5): Final urgency. "Wanted to follow up one more time before the tax credit steps down"

500 homes x 3 drops x $1.35/card = $2,025 total investment.

At 1.89% average response across 1,500 total touches, that's roughly 28 responses. Close 25% and you've got 7 new installs from a $2,025 campaign.

Average install revenue: $32,000. That's $224,000 in gross revenue from $2,025 in marketing spend.

Can you actually track direct mail?

The old argument against direct mail was "you can't track it." That's not true anymore.

With per-piece QR codes, you know exactly which postcard drove which response. With USPS Intelligent Mail barcode tracking, you know when each piece was delivered.

After your first campaign, you have real data:

Which neighborhoods responded best
Which message angle pulled higher
Which homeowner profile converts
Your actual cost per lead and cost per install

Use that data to refine your list and message for the next campaign. By your third round, you've built a direct mail machine that consistently delivers $67 leads while your competitors are paying $1,929 on Google.

The Real Advantage

Google Ads puts you in a bidding war with every solar installer in your market. Direct mail puts you in a mailbox where you're the only solar company.

That's not a small difference. That's a structural advantage.

Build your targeted solar campaign at mailbots.ai. Upload your list, write your message, and we handle the rest. Handwritten postcards from $1.35/card at 200 pieces down to $1.10 at volume, with per-piece tracking.