Model Before
You Build or Retrofit
You can have a whole-building thermal simulation that quantifies loads, comfort, and annual consumption. We ensure that every decision is tested in software before it costs you in reality. First, estimate your building’s energy, and if you needed more precision, request a simulation.
Peak Load Quick Check
Use this free building energy simulation calculator to get a first-pass estimate of your building’s peak heating and cooling load and annual energy demand. Enter your floor area, ceiling height, insulation level and climate zone, and the tool models both cold-season and warm-season performance in seconds. It’s a fast way to size HVAC equipment before committing to a full simulation. For permit-grade numbers accurate to within ±10%, our calibrated building energy model refines these estimates using your actual plans and utility bills.
Curious what heat pumps, boilers and pumps cost?
The estimate above sizes your building’s heating and cooling load. Once you know the capacity you need, our Energy Prices page tracks indicative average market prices for heat pumps, boilers and pumps by brand, useful for early budgeting, ahead of a full simulation and quote.
From plans to validated numbers
Our building energy simulation process turns architectural plans and utility data into a validated, calibrated model of how your building actually performs, not just how it looks on paper. Each step below builds toward numbers you can trust for permits, certifications and renovation decisions.
Data intake
Plans, occupancy schedules, utility bills and local weather files (TMY3 / Meteonorm) form the foundation of an accurate building energy model.
Model build
Geometry, envelope, glazing and internal gains are assembled in EnergyPlus / OpenStudio, the same simulation engines recognized by LEED and BREEAM. AI tools accelerate this setup, and every input is verified by our engineers before calibration.
Calibration
The model is tuned against your real utility bills until deviation sits inside ±6%, so the simulation reflects how your building actually performs.
Scenario runs
Envelope upgrades, system options, setpoints and PV/battery interplay are tested side by side, so you can compare retrofit options before spending a dollar.
Report & roadmap
Every measure is ranked by ROI and payback period, with inputs and assumptions logged line by line for full transparency. The draft report is AI-generated, then reviewed and signed off by a licensed engineer before it reaches you.
What lands in your inbox
Every building energy simulation project ends with a complete technical package you can hand to contractors, lenders or certification bodies. Here is exactly what’s included. All deliverables are produced with AI assistance and personally reviewed by our engineering team before delivery.
Load report
Room-by-room heating & cooling peaks in kW, with the drivers behind each number so you know exactly why the load is what it is.
Annual energy
kWh/m²·yr split by end-use, with monthly profiles you can compare directly against your utility bills.
Comfort analysis
Operative temperatures and overheating hours per zone, season by season, so comfort problems surface before construction, not after.
System sizing
Equipment capacity with justified safety margins. No oversizing, no short-cycling, no unnecessary noise.
Calibration log
A bills-versus-model deviation table plus every assumption, versioned per file, so the simulation stays fully auditable.
Retrofit roadmap
Measures ranked by payback and carbon savings, phased to match your budget and timeline.
Ready when you are
Tell us about your building and what you’re trying to achieve, whether that’s a retrofit, new construction or certification. We’ll reply with a tailored building energy simulation scope, a realistic timeline and a fixed quote within 48 hours.
A villa that argued with its boiler
Simulation showed the real enemy wasn’t the boiler. It was the envelope and an oversized, short-cycling unit. The model tested three futures before a single euro was spent, and the winning path came from the data, not a guess.
- Baseline: 42.6 MWh/yr thermal, 310 overheating hours.
- Envelope first: roof + glazing upgrade cut demand by a third.
- Right-sized plant: 62% smaller boiler, quieter and steadier.
See your building’s numbers before you spend.
Send your plans and a year of bills. We’ll return a calibrated model, a ranked roadmap and the math behind both.
Response within 48h · NDA on requestCommon questions
What exactly is building energy simulation?
It’s a physics-based digital twin of your building. We input your geometry, materials, climate data and usage schedules, then run thermodynamic equations to predict exactly how much energy it will consume and how comfortable it will be. This is the same core methodology architects and engineers rely on for LEED and BREEAM energy modeling requirements.
How accurate are your models?
Our calibrated models typically achieve a deviation of less than ±6% against actual utility bills. We don’t just guess; we tune the model until it matches your historical reality before predicting the future.
What software do you use?
We use industry-standard engines like EnergyPlus and OpenStudio, wrapped in our own validated workflows. This ensures our deliverables are recognized by green building certifiers (LEED, BREEAM) and local authorities.
Do I need a simulation for a small residential project?
If you are doing a standard renovation, maybe not. But if you are adding complex systems (heat pumps, PV, batteries), changing the envelope drastically, or building a passive house, a simulation prevents costly oversizing and comfort issues.
How long does a typical simulation take?
A standard residential or small commercial project takes 5 to 10 working days from the moment we receive complete architectural plans and utility data. Larger or complex facilities are scoped individually.
Is AI used in your building energy simulation?
Yes. We use AI tools to speed up data processing and initial model drafting, but every simulation is reviewed, calibrated and signed off by a qualified engineer before it’s delivered. AI handles the heavy lifting; a human is always responsible for the final numbers.