Most residential solar installers are great at the install and stuck on the top of the funnel. Broker leads cost more every quarter, close at single-digit percentages, and arrive already shopped to three competitors. Door-knocking teams burn out. Facebook ads send tire-kickers. Trucks sit on Wednesdays in November.
This guide lays out exactly what works in residential solar marketing in 2026, what doesn't, and what the unit economics look like channel by channel. Written for installers running anywhere from one crew to a regional operation.
Why most marketing fails for residential solar
Solar has four properties that break standard small-business marketing:
- It's specific to the home, not the homeowner. Roof orientation, shading, age, and structural condition determine whether the home is even viable — before income or interest matters. Broad-audience ads can't filter for any of this.
- It's visual. Until the homeowner sees panels on their actual roof, they're imagining something abstract. Generic stock photos of "a house with solar" don't trigger the buying reflex.
- It's high-ticket and financed. A $15,000–$40,000 install means you need real intent at the top of the funnel — and homeowners need to understand how financing or the federal 30% ITC makes the monthly math work. Cold ad traffic burns budget on people who never had the budget.
- It's a long sales cycle. 30–90 days from first contact to install means short-window channels (one-off ads, single door-knock) don't get the homeowner across the line on their own. The acquisition channel has to be paired with a nurture flow.
The marketing channels that compensate for these four properties are the ones that produce predictable revenue. The ones that ignore them produce frustration and high CAC.
The five marketing channels solar installers actually use (and which work)
1. Mailed solar quotes — the highest ROI channel
A mailed solar quote is a 6×9 postcard sent to a specific homeowner showing their actual roof rendered with solar panels installed, plus their projected monthly savings, plus a QR code linking to a personalized landing page with the federal ITC applied and a refundable site-survey deposit button. The homeowner doesn't have to imagine anything — they see their own roof, panels installed, savings number on the front.
The mechanic works because recognition beats imagination. When a homeowner sorts mail over the recycling bin, they have about 1.5 seconds per piece to decide keep-or-toss. A postcard with their own roof on it freezes them. A postcard with a generic photo doesn't.
Solar Launch is the platform built specifically for this channel. You type in a street name, AI renders every house with panels on the south-facing roof, Google Solar API models the production and 25-year savings, postcards print and mail automatically, and scans land on a homeowner-specific page with ITC math and a Stripe site-survey deposit button. See how it works.
2. Door-knocking (D2D)
Door-to-door is still the most common acquisition channel in residential solar — and the most expensive per closed install. A high-performing D2D rep does 80–120 doors a day and closes 2–4 site surveys per week, of which 30–50% become installs. Loaded cost per closed install: $1,200–$2,500 once you account for rep pay, training, churn, and management overhead.
D2D works best as a tight-radius follow-up channel after a neighborhood has been warmed up by mailed solar quotes. The homeowner who received the postcard 7 days ago and saw their roof with solar on it has a completely different conversation with the door-knocker than the cold knock has. (Solar Launch automates the postcard side and lets D2D teams focus on the warm follow-up.)
3. Broker leads
Solar broker leads — Modernize, SolarReviews, EnergySage, HomeAdvisor — are the easiest channel to start with and the most expensive at scale. Typical pricing is $50–$200 per lead, close rates run 1–3% (because the lead has been sold to 3–5 competitors), and the loaded CAC ends up in the $1,500–$3,000 range per closed install.
Broker leads have one strong use case: filling capacity gaps when your self-generated channels are still ramping. Once your self-generated CAC drops below your broker-lead CAC, shift the budget. Most installers never make that shift and stay locked into 20–25% gross margins because the leads eat them.
4. Facebook ads
Facebook ads underperform for cold solar acquisition. The audience targeting can't filter for the four properties above. The best-performing Facebook campaigns for solar installers are retargeting — showing ads only to people who already visited the website or scanned a postcard. Those convert at a fraction of the cold-traffic CPA.
If you're spending $5K/month on Facebook for cold acquisition and your CAC is over $1,500, the channel isn't broken — you're using it for the wrong job. Retargeting works; cold acquisition rarely does in solar.
5. Google ads
Google ads have one strong use case for residential solar: capturing brand searches (people who already heard about you) and high-intent bottom-of-funnel queries like "[city] solar installer" or "rooftop solar quote [zip]." For broad keyword acquisition like "solar panels," competition from EnergySage and SolarReviews inflates costs to $30–$80 per click and the leads convert poorly because the searcher is still in research mode.
A reasonable Google ads setup: spend small ($500–$1,500/month) on bottom-of-funnel keywords and brand-search defense. Don't try to compete on top-of-funnel terms.
Channel-by-channel comparison
| Channel | Typical CAC | Predictability | Scalability | Best for |
|---|---|---|---|---|
| Mailed solar quotes | $250–$500 | High | High | Filling the calendar in any season |
| Door-knocking (cold) | $1,200–$2,500 | Medium | Medium | Specific neighborhoods, warm follow-up |
| Broker leads | $1,500–$3,000 | High (volume) | High (\$) | Capacity fill while self-gen ramps |
| Facebook ads (cold) | $1,500–$3,500 | Low | Medium | Brand awareness, rarely acquisition |
| Facebook ads (retargeting) | $150–$400 | High | Medium | Closing warm leads |
| Google ads (bottom of funnel) | $400–$800 | Medium | Low | Capturing in-market intent |
Recommended budget allocation for a solar installer doing $1M–$5M/year
50–60% mailed solar quotes. This is your acquisition engine. At $1 per quote and a 15–20% scan rate, a 1,000-postcard campaign costs $1,000 and typically returns 3–8 closed installs at $20K average ticket.
15–25% D2D (warm follow-up). Route reps through neighborhoods that received postcards 7–14 days ago. Conversion rate doubles vs cold knocking and the rep's day is half the burnout.
10–15% retargeting ads. Anyone who visits the site or scans a postcard gets a low-budget Facebook/Instagram retargeting campaign. Don't waste cold-acquisition spend.
5–10% bottom-funnel Google ads. Capture brand searches and "[city] solar installer" queries.
5–10% broker leads. Only to fill capacity gaps — not as the primary engine.
How to start: the 45-minute first campaign
- Pick a neighborhood with $400K+ median home value. Check Zillow or Redfin for the zip code. Solar is a $15K–$40K install — homeowners need to either be able to write that check or qualify for solar financing on the same number.
- Render the street. Use a tool like Solar Launch that pulls every house from Google Street View, AI-renders each with solar panels installed, and pairs each with a Google Solar API production analysis. Free to render — you only pay when you mail.
- Pick a postcard template. The rule: rendered roof at the TOP of the card, projected monthly savings in bold under it, your logo small and in the corner. Recognition before brand.
- Press send. 200 postcards at $1 each = $200 total. Printing, addressing, postage, USPS handoff — all automatic.
- Wait 3–6 weeks. Homeowners scan, see their roof with panels and the ITC-adjusted savings math, book a refundable site-survey deposit. Your dashboard fills up.
Average installer using this exact workflow returns $32 in install revenue for every $1 spent on mailed solar quotes. Create a free Solar Launch account — you only pay if you decide to mail.
Common questions
How long does it take to see results from a mailed solar quote campaign?
Most installers see their first scans within 7–10 days of the postcards landing in mailboxes. Site-survey deposits start coming in within 2–3 weeks. The full sales cycle (deposit → install complete) plays out over 30–90 days. The acquisition signal (scans + deposits) shows up much faster than the revenue.
What if my service area is rural or lower density?
Rural neighborhoods can still work if median home values support the install ticket and the homes have viable south-facing roofs. The bigger filter is income + roof viability, not density. A 200-home rural neighborhood at $500K median with mostly south-facing roofs can outperform a 200-home urban neighborhood with 40% shaded north-facing roofs.
Does this work for solar resellers without an install crew?
Yes — many sales-only organizations use the same workflow and sub out the install to a partner crew. The customer portal can route the homeowner to a partner-install scheduler after the deposit, and the sales org keeps the lead-gen + close margin without owning the install logistics.
Does the federal ITC actually move buyers?
Yes, but only when the math is surfaced specifically for the homeowner's system size and bill. "30% off" is abstract. "$11,400 off your $38,000 system, which makes the monthly payment $187 vs your current $260 electric bill" is concrete. Solar Launch's customer portal does this automatically per render.
The fastest way to start.
Type in a street. Render every roof with solar. Mail the postcards with each homeowner's savings on the front. Watch site-survey deposits roll in. Average return: $32 per $1 spent.
Create my free account →