0% for 12 months on purchases and 0% for 21 m… Citi® Diamond Preferred® Credit Card Calculators How we make money
VOATLAS
How to Buy a Smart Home Energy Monitor

How to · Tech

How to Buy a Smart Home Energy Monitor

Track your electricity use with a smart home energy monitor during Earth Day sales and spread the cost with zero interest.

VoAtlas editorial Updated · 3 min read
Typical cost $400 before anything else
Across the 0% window $26.67/mo 15 months, no interest

How we got that: $400 spread evenly across the 15-month introductory window on the Discover it® Cash Back. Checked · at the bank Carry a balance past the window and the standard APR applies to what is left.

A home energy monitor clamps inside your electrical panel to show you exactly which appliances are draining your power in real time. You want to buy one durable unit that lasts for years, not a cheap version you have to replace in twelve months.

Earth Day sales in April are the best time to look for price drops on these devices. Watch for the brand's new model release right before the sale, because last year's version usually drops in price while doing almost the exact same job.

That 0% intro APR for 15 months on purchases and balance transfers is a deadline, not free money. If you still have a balance left when those 15 months are up, the card company will tack on interest for what is left.

The steps

  1. 01

    Check your electrical panel

    Open your breaker box and look at the space available. Some monitors need physical room for extra sensors, and older panels might need an electrician to help fit them safely.

  2. 02

    Wait for Earth Day sales

    Retailers discount energy gear around April to match the green-living holiday. Look for standard prices around $400 to drop before you pull the trigger.

  3. 03

    Spread the cost

    We can use the Discover it® Cash Back card to break that $400 into smaller chunks. The card gives you 0% intro APR for 15 months on purchases and balance transfers, which comes out to about $26.67 per month if you divide the cost evenly across that window.

  4. 04

    Account for installation

    Factor in the cost of an electrician if you are not comfortable working inside a live breaker panel. Paying a pro ensures the CT clamps go on the right wires and keeps your insurance happy.

  5. 05

    Keep the app simple

    Download the monitoring app and set up basic alerts for high usage. Ignore the advanced automation features until you figure out your baseline power draw for the first month.

  6. 06

    Check the card terms before you commit

    Every figure we publish for the Discover it® Cash Back carries the date a person verified it against Discover and a link to where they checked. Intro windows and APRs change without notice, so confirm the current terms before applying.

    See Discover it® Cash Back terms →

Common questions

Do I need an electrician to install an energy monitor?

Usually yes, unless you are very comfortable working inside a main breaker panel. A pro can safely attach the sensors around your main incoming power lines in under an hour.

Will this monitor save me money on my electric bill?

The monitor itself does not save power, but it shows you which appliances are secretly eating electricity. Once you spot the waste, you can change your habits to lower the bill.

Do these monitors need a monthly subscription?

Most major brands work out of the box without paying a monthly fee for basic tracking. Some offer paid tiers for historical data storage, but the free version is usually enough.

What happens when the 0% intro window ends?

You start paying standard interest on whatever is left of that $400 balance. Set up automatic payments to clear the total before the 15 months run out.