ENERGY-SAVING GUIDES

Energy-Saving Guides

Actionable guides, formulas, and practical explanations to help you understand home energy use, utility costs, appliances, heating, cooling, EV charging, and solar payback.

18 practical guides Transparent formulas and examples Connected to calculators
Energy Formulas
W × h ÷ 1000 = kWh

Understand the math behind your bill.

Appliances
EV & Solar

Featured Guides

Start with the most useful energy topics for understanding bills, rates, and appliance costs.

Essential Reading

Understanding Your Electricity Bill

Learn how to read your bill, understand different charges, and find your true rate per kilowatt-hour.

6 min read Read Guide →
Popular

How to Calculate Appliance Electricity Costs

The formulas and methods for estimating how much any household appliance costs to run.

3 min read Read Guide →
Popular

Heat Pump vs Furnace Efficiency

A detailed comparison of heating methods to help you choose the most cost-effective option.

2 min read Read Guide →

Browse by Topic

Explore guides by energy topic and find the most relevant learning path.

Electricity Basics

Learn about your bill, rates, and the difference between watts and kWh.

6 guides Explore →

Appliances & Lighting

Calculate running costs, read EnergyGuide labels, and reduce standby power.

6 guides Explore →

Heating & Cooling

Compare heat pumps, furnaces, and calculate AC running costs.

4 guides Explore →

EV & Solar

Explore home EV charging levels and solar payback periods.

2 guides Explore →

Complete Guide Library

Browse all DataWisdom guides on electricity bills, appliance energy use, heating, EV charging, solar payback, and more.

Not sure where to start?

01

Understand Your Bill

Start with Understanding Your Electricity Bill.

02

Estimate Appliance Costs

Read the appliance-cost guide and use the Calculator.

03

Compare Heating & Cooling

Explore AC, space-heater, and heat-pump guides.

04

Plan EV or Solar Costs

Explore EV charging and solar payback guides.

Practical guidance built on transparent methods

  • Formulas are clearly explained
  • Examples are marked as illustrative
  • Limitations and assumptions are stated
  • Authoritative references are linked where relevant
Read DataWisdom’s Methodology →
GUIDE LIBRARY QUESTIONS

Guide FAQs

Find answers about choosing a guide, understanding energy topics, and connecting guides with relevant calculators.

Browse all calculators →

WHAT YOU WILL FIND HERE

  • Help choosing the right guide
  • Links between guides and calculators
  • Practical explanations of energy topics
Which home energy guide should I read first?
If you are new to understanding your home's energy use, we recommend starting with our Understanding Your Electricity Bill guide. It explains the foundational concepts, like finding your true rate per kWh, which you will need to use our calculators effectively.
How can I calculate the electricity cost of an appliance?
You need to know the appliance's wattage, how many hours it runs, and your local electricity rate. Read our guide on How to Calculate Appliance Electricity Costs for the exact formula, or use our Appliance Energy Cost Calculator to do the math instantly.
Where can I find my electricity rate per kilowatt-hour?
Your electricity rate is located on your monthly utility bill, but it can be confusing to find. Some bills show a single blended rate, while others split supply and delivery charges. Check our guide on How to Find Your Electricity Rate for step-by-step instructions to find the right number to use in our calculators.
Why might my actual utility bill differ from an estimate?
Our calculators provide estimates based on average use and stated wattage. Real-world bills differ due to variable appliance efficiency (like a fridge working harder in a hot room), changing time-of-use rates, phantom loads, and utility taxes or fixed fees. Read our Methodology to understand our assumptions.
Which guides explain EV charging and solar payback?
For electric vehicles, start with our comparison of Level 1 vs Level 2 EV Charging. If you are considering solar panels, our Solar Panel Payback Period Explained guide walks through the return-on-investment calculation.
Looking for a question that is not covered here? Contact DataWisdom.