What the Aprilaire E100 costs to run
The Aprilaire E100 is certified by ENERGY STAR at 821 kWh a year, one of the more expensive models in its category to run among dehumidifiers currently certified.
The $154 figure above uses the simple average of all 51 published state rates. Pick your state for the real number.
Where this ranks
That's 117.2% above the dehumidifier category average of 378 kWh/yr, and ranks 537 of 546 certified dehumidifiers for annual running cost, 1 being cheapest. Every one of the 546 currently-certified dehumidifiers feeds that average, putting this model about $83/year over it. See how it's calculated on the how it is calculated page.
The closest alternatives by cost
Sorted by running cost among dehumidifiers, one step cheaper is Wellsle YDL24P ($149/yr, 791 kWh/yr), and one step pricier is Santa Fe 4047300 ($158/yr, 842 kWh/yr).
Comparing Aprilaire's own models
Aprilaire makes 3 ENERGY STAR certified dehumidifiers; this one ranks 2 of 3 for running cost, between the brand's cheapest, the E080 at $119/yr, and its priciest, the E130 at $174/yr.
Lifespan
NAHB's Study of Life Expectancy of Home Components does not publish a figure for dehumidifiers, so no lifetime cost is shown here rather than a guessed one. The annual and monthly figures above stand on their own.
Weighing a replacement
The Aprilaire E100 runs above its category average. If the dehumidifier you actually own is older still, likely well past ENERGY STAR's efficiency baseline when it was made, a current certified model could cost meaningfully less than this model's $154/year every year.
See what else is certified in this category before you decide.
Protecting what you have
At $154/year just to run, a dehumidifier is worth protecting against an unplanned repair bill on top of that.
The data behind this page
Two sourced numbers, nothing modeled: ENERGY STAR's certified kWh/yr for this exact model, and EIA's published state electricity rate. At rank 537 of 546 for running cost, see the dehumidifier category page for the rest of the field, or the guide to how much your state matters.