Summer Fan Instead of an Air Conditioner: How to Save Up to 80% on Electricity Costs

Summer fan or air conditioner — which saves more money?

In many rental apartments, a modern fan in peak summer usually saves you 50–80% in electricity costs compared with a portable air conditioner — with slightly less, but often completely sufficient, cooling performance.

In this guide, you’ll first see the numbers in dollars. After that, you’ll get simple steps to start right away and keep your costs under control.

Base assumptions: How we calculate the comparison

• Electricity price: €0.35 per kWh (kWh = kilowatt-hour)
• Summer season: 3 months (June through August)
• Typical usage days: 90 hot days
• Fan wattage: about 50 W
• Portable air conditioner: about 1,000 W (1 kW)
• We use simple sample values. Your actual numbers may vary slightly.

Master table: Cost comparison fan vs. portable air conditioner

The table shows three household types, so you can quickly see how much you can save with a fan.

*Total cost per summer season = electricity costs for 3 months + allocated purchase cost (roughly: we assume 100% depreciation in the 1st summer).

What does the table mean for your wallet?

• In a single-person household, you pay about €426 with an air conditioner in the first summer, and about €39 with a fan. Savings: about 80%.
• As a couple, you pay about €589 with an air conditioner and about €82 with fans. Savings: more than 80%.
• As a family, you pay about €420 with an air conditioner and about €128 with fans. Savings: about 70%.
• The longer you use the devices, the more the fan’s low power consumption matters.

Important: An air conditioner cools the air more strongly. But a fan often already feels very comfortable if you use it smartly.

Step 1: Calculate your personal usage profile

You can quickly check what summer costs you. Here’s how:

• Write down: Which rooms do you want to cool? (e.g., bedroom, living room)
• Estimate: How many hours per day will the device run during peak summer?
• Estimate: How many hot days do you get? (e.g., 60–90 days)
• Note the wattage of your device in watts (listed on the nameplate).
• Calculate like this:
  • Watts / 1000 = kW
  • kW × hours per day × days per month = kWh per month
  • kWh × electricity price = electricity cost per month

Example for a fan: 50 W = 0.05 kW, 6 hours per day, 30 days: 0.05 × 6 × 30 = 9 kWh. At €0.35 per kWh, you pay 9 × 0.35 = €3.15 per month.

Tip: Enter these numbers in your budget log. That way you keep an overview and can compare year to year.

Step 2: Plan a combo strategy (fan + shading + airing out)

You don’t have to choose “either/or.” You can also use a combo strategy. Here’s how to save a lot of electricity even if you use an air conditioner:

• Shade during the day:
  • Close shutters or curtains during the day, especially on the sunny side.
  • This keeps the apartment from heating up as much. It saves many hours of device runtime.
• Cross-ventilate at night:
  • When it’s cooler outside than inside, open several windows wide.
  • Place a fan near one window so air moves through well.
  • This often replaces 2–3 hours of air conditioner per evening.
• Run the air conditioner for less time:
  • Use the air conditioner only to break the worst of the heat.
  • After that, maintain the temperature with a fan and closed shutters.

If you save just 2 hours of air conditioner use per day, that alone can bring €10–€20 in electricity savings per month — depending on the device’s wattage.

Step 3: Set realistic temperature targets

Many people set the air conditioner very cold. That costs a lot of electricity and often isn’t necessary.

• Set a comfort target of about 25–26 °C.
• Set the air conditioner so it shuts off just above that temperature.
• Write your target on a note and stick it next to the device:

“Goal: 25–26 °C. Don’t set it colder!”

• Use the fan to move the air. That way, even 26 °C can feel fresh.

Just 1 degree warmer than your usual setting can save a few percent of electricity. In an apartment, that can quickly add up to €10–€30 per summer.

Step 4: Keep an eye on electricity costs (with simple tracking)

You can easily check your real consumption. That way you’ll immediately notice whether your measures are paying off.

• Option 1: Record meter readings
  • Write down your electricity meter reading once per week.
  • Record date and time in your budget log.
  • Compare weekly numbers with heat waves and how you used your devices.
• Option 2: Smart plug
  • Use a simple switchable outlet with energy-use display.
  • Plug the fan or air conditioner into it.
  • Read the kWh usage once per week.

Then compare your numbers with the master table. You’ll see whether you use a similar amount of power — or whether you can save even more.

Step 5: Finance the purchase smartly (without overdrafting)

A new device costs money. With a small “summer buffer” in your budget log, you can handle the expense more easily.

• Decide early: Do you need fan(s) or an air conditioner?
• Roughly map the purchase costs from the table to your situation.
• Starting in spring (e.g., March), set aside a fixed amount each month:

• Example: fan for a single:
  • Cost about €30.
  • You set aside €10 per month for 3 months.
  • In June you can buy the fan without overdraft costs.
• Example: fans for a family:
  • Three simple fans for about €90 total.
  • You set aside €15 per month for 6 months.
  • Then you have the amount saved up and immediately reduce electricity costs in summer.

Your advantage: You avoid expensive overdrafts and still have a device that helps you save money and stress every year.

When is an air conditioner still worth it?

An air conditioner can make sense if:

• You live in a very hot top-floor apartment.
• You have health reasons and can’t tolerate extreme heat.
• You want to cool only a few rooms very strongly, briefly, and on purpose.

Even then, you can significantly reduce the device’s runtime and save a lot of electricity with the tips above. Often it’s enough to run the unit only during the extremely hot hours and bridge the rest with a fan, shading, and airing out.

Conclusion: How to implement your savings strategy now

• 1. Today: Check whether one or more fans are enough for your apartment.
• 2. This week: Create your usage profile and enter the numbers in your budget log.
• 3. Next heat wave: Test the combo strategy of shading, nighttime ventilation, and a fan.
• 4. Ongoing: Record your consumption once per week (meter or plug).
• 5. Long term: Build a small summer buffer every spring so you can buy or replace devices without stress.

This way you fully leverage the advantages of a fan. You keep your apartment comfortable, control your costs, and — depending on your living situation — often save 50–80% in electricity costs compared with a portable air conditioner.