Model
Samsung QN77S90FAF
Rank #140 means 139 of the 172 television models we track cost less to run each year; the 25th efficiency percentile means it uses less energy for its size than 25% of those models.
What does the Samsung QN77S90FAF cost to run per year?
The Samsung QN77S90FAF costs about $53 a year to run, well up the cost table for its class at rank #140 of 172. Size-adjusted, this model trails most of its class on efficiency, ahead of just 25% of television models we track. Its on-mode draw of 154.71 W is the number ENERGY STAR measures directly and the one this running-cost figure is built from.
Immediately around it on the leaderboard, the Samsung QN77S85DAE at $53/yr runs a little cheaper and the Lg OLED77G6WU* at $53/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A television typically stays in service for somewhere around 7 years; over that span, the Samsung QN77S90FAF's $53/yr adds up to roughly $371 in electricity alone, before purchase price or repairs.
By the numbers
The Samsung QN77S90FAF normalized against its whole class, so each figure means something.
What it costs you over time
Running cost is an every-year number, so it compounds. At $53/yr, here is what the Samsung QN77S90FAF adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Samsung QN77S90FAF costs about $530. That is roughly $180 more than the class median, which would run closer to $350 over the same ten years.
How the Samsung QN77S90FAF compares
The television class we track runs from $3 to $117 a year. At $53/yr, it runs about $18 a year above the class median of $35, and it is about $50 a year more than the cheapest television to run at $3.
What drives its running cost
At 76.8 in, the Samsung QN77S90FAF is a large television for its class, which spans 13.23 to 114.4 in with a median of 55 in, size is usually the single biggest lever behind a running-cost figure, and at this end of the range there is more capacity to service, which tends to push the number up. Its on-mode power draw of 154.71 W (the class spans 9.3 to 343.5 W) is the direct input into the running-cost figure, and the picture-brightness setting you choose is the single biggest lever you control over it day to day.
- On-mode brightness. On-mode watts, the figure ENERGY STAR measures at the factory picture setting, can differ a lot from what a TV actually draws once you change the picture mode.
- Screen size. Screen size is the single strongest predictor of a TV's on-mode wattage, ahead of panel technology or brand.
- Hours of use. Running cost compounds with hours of use, so this figure is really a per-hour rate multiplied by a standard viewing assumption, not a fixed annual bill.
Common questions
Is the Samsung QN77S90FAF cheap to run?
Its $53/yr running cost, rank #140 of 172, is above what most television models we track cost to run, so this is not one of the cheaper picks on electricity alone.
How much does the Samsung QN77S90FAF cost per month?
About $4.43 a month, which is the $53 annual estimate spread across twelve months at the US average rate of $0.1856/kWh. Your own bill scales with your local electricity rate and how heavily you use it.
How is this running-cost figure calculated?
The formula is annual kWh times price per kWh: 287 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $53 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Samsung QN77S90FAF for its size?
25th percentile once size is factored in. That means its size-adjusted efficiency is not the main reason for the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 139 | Samsung QN77S85DAE76.6 in | $53 |
| 138 | Samsung QN65S95DAF64.5 in | $51 |
| 137 | Samsung QN65QN95DAF64.5 in | $51 |
| 136 | Lg OLED65C5***64.5 in | $51 |
| 135 | Sansui LE-75VA174.37 in | $51 |
Source
ES_1023593_QN77S90FAF_020420251012648_4727578View certified television listingsENERGY STAR data as of July 2026Samsung and QN77S90FAF are used here for identification only and are not endorsements. Figures are computed by WattWise Labs from public ENERGY STAR data, not measured in our own lab.