A deposit is the one payment you make before anything is installed, so it is the payment with the least proof behind it. Before you sign, decide how the money will move from your account to the installer's, and write that plan into the contract instead of trusting it to a verbal agreement.

Ask what the deposit covers

Find out whether the deposit is a fee for scheduling, a payment toward the equipment, or a share of the full price. Those three arrangements leave you in very different positions if the job is cancelled or delayed. A scheduling fee is usually the smallest amount at risk. A payment toward equipment means the installer may need to order parts, so ask who owns that equipment until it is paid for and installed.

Check the schedule of payments

A sound schedule ties each payment to something you can see or test. Common milestones are equipment delivered to the site, installation finished, and the system running and tested. Be wary of a schedule that asks for most of the money before the equipment is on your property. Compare the percentages in the written contract to the milestones listed. If the milestones do not match what the installer described, ask for them to be corrected before you sign.

Confirm how a refund works

Read the cancellation terms and get answers to these questions in writing:

Is any part of the deposit refundable, and if so, under what conditions?

Is there a stated time limit for requesting a refund?

Are restocking charges or special-order costs taken out before money comes back to you?

If the installer cannot complete the work, who decides, and within what timeframe?

Keep a record of every payment

Pay by a method that leaves a trail, such as a card or a check you can trace. Ask for a written receipt that lists the amount, the date, what the payment applies to, and the balance still owed. Keep receipts with the signed contract. Cash payments, and payments sent to a personal account rather than the business name on the contract, are harder to recover if something goes wrong, so confirm the exact account and name before you pay.

Compare before you pay

When you have two or more quotes, put their payment schedules side by side with their scope and their cancellation terms. A quote with a lower total and a larger early deposit can cost you more if the job falls through. Write down the final amount you will pay, including any items the schedule leaves out.

If anything in the payment terms is unclear, ask for it in writing before you hand over money. If a dispute comes up later, a professional who reviews contracts for a living is the right person to ask about your options.