EnergyPlus

Engineering & science

Free open-source softwareEditorial overview
A CLOSER LOOK

What is EnergyPlus?

EnergyPlus is a whole-building simulation engine for evaluating energy consumption and related thermal behavior. It models building systems and operating conditions through detailed inputs, supporting researchers and engineers who need reproducible analysis of design or operational alternatives.

Building energy simulation

Thermal zones

HVAC modeling

Weather-based analysis

Is it a good fit?

Best suited to

Building-performance specialists evaluating energy scenarios

Before you choose

Input preparation can be complex. Results depend heavily on schedules and assumptions.

Editorial assessment based on the provider’s published information. Our method

Know what you're signing up for.

The BSD-like open-source license software is available without a license subscription and includes Building energy simulation and Thermal zones. This covers the downloadable application, while optional support, third-party services, and separately licensed materials have their own terms.

No software subscription; hardware, support and any separately licensed extras are not included.

Check current official pricing

The useful parts. The trade-offs.

Why consider it

Detailed building-performance engine

Suitable for reproducible scenario comparisons

What to keep in mind

Input preparation can be complex

Results depend heavily on schedules and assumptions

How to use it well

Begin with a validated example and a suitable weather file, then replace geometry, constructions, schedules, and systems systematically. Check warnings and energy balances before comparing alternatives. Keep occupancy and operating assumptions visible in reports, since apparent savings can reflect changed inputs rather than a better-performing design.

This is best suited to building-performance specialists evaluating energy scenarios. Before committing a larger project, account for these trade-offs: input preparation can be complex; results depend heavily on schedules and assumptions.

A few things you might be wondering.

Is EnergyPlus free?

The BSD-like open-source license software is available without a license subscription and includes Building energy simulation and Thermal zones. This covers the downloadable application, while optional support, third-party services, and separately licensed materials have their own terms.

Is EnergyPlus a complete graphical building design application?

It is primarily a simulation engine, often used through other interfaces.

Why are operating schedules important?

Occupancy and equipment schedules can substantially influence predicted energy use.

Where can I check the latest prices?

Use the provider link on this page. Billing period, location, team size, promotions, taxes, and optional extras may affect the amount you pay.

How should I compare this tool with alternatives?

Choose tools for the same task, then compare their feature limits, platform support, and total cost for your team. The Compare button helps you keep a shortlist.

Are the user reviews moderated?

Yes. New reviews are submitted for moderation. We show published user reviews separately from the editorial overview and never assign a default user rating.

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