Home Solar: The Complete Guide

Most solar research starts in the wrong place: comparing quotes before understanding what actually drives the number on them. This guide is the starting point instead — the handful of things that determine whether a solar quote is fair, and whether solar makes sense for your house at all.

Start with the real cost drivers, not the sticker price

A solar quote bundles five different cost categories — equipment, labor, soft costs, balance-of-system parts, and installer margin — and two installers quoting the same roof can differ by thousands of dollars while both being reasonable, depending on equipment tier and overhead. Our breakdown of 2026 solar costs walks through this by system size, with the specific line items worth asking an installer to itemize.

Understand the federal credit correctly — it's a credit, not a rebate

The 30% federal credit is the single most consequential number in most solar math, and it's also the most commonly misunderstood — it's a nonrefundable credit against taxes owed, claimed the year the system is placed in service, not a discount applied at the point of sale. Our federal solar tax credit guide covers exactly how to calculate your real number, including what happens if your tax liability is smaller than the credit.

Check whether your state adds anything on top

State incentive programs vary enormously in structure and availability — some states offer meaningful rebates or performance-based payments, others have capped programs that can close before you apply, and some offer nothing beyond the federal credit. See our guide on how state incentives differ from the federal credit for how to check your specific situation.

Know how you'll be compensated for excess power

This is the piece most often skipped, and it materially changes payback math: whether your utility uses net metering (crediting excess solar at close to the retail rate) or net billing (crediting it at a lower export rate) changes whether a battery becomes financially important. Our net metering vs. net billing explainer breaks down the difference and how to find out which applies to you.

Read the warranty structure before you sign

"25-year warranty" on a quote usually bundles two separate guarantees — a product warranty against defects, and a performance warranty guaranteeing minimum output over time — plus a separate, often shorter, installer workmanship warranty. Our solar warranty guide explains what each one actually protects and the questions worth asking before signing.

Run your own numbers

Skip the national averages — use our Solar Savings Calculator and Federal Tax Credit Calculator with your actual utility rate and project cost.