“Energy-efficient homes are too expensive to build.” If customers who think this way learn the facts written in this book, they will decide to build an eco-house. This book guides you through the know-how that housing professionals should know. Regarding energy conservation, you thought you knew it all, but in reality, you didn't understand it correctly. The book points out common misconceptions about energy conservation that housing professionals might make when explaining to consumers. It provides unique calculations of costs and other figures to help you attract customers who are highly interested in energy conservation. Packed with information that housing design professionals should know to differentiate themselves from other companies. If the homeowner also knows the contents of this book, they will be able to understand the capabilities of the construction company. The book clearly explains 25 common misunderstandings, categorized by theme. By correctly understanding the "common sense" of energy conservation that both consumers and professionals often misunderstand, you can not only reduce complaints after the house is completed but also provide satisfactory responses to customers interested in eco-houses. ● Main Contents 1. Knowing Eco-Houses  Natural materials are not eco-houses / 6 items to escape "housing poverty" / Easy! Energy-saving measures for existing houses / The reason why few people know about warm houses / Houses that become shelters in disasters 2. Knowing the Power of Air Conditioners  If insulation performance is low, you'll dislike air conditioners / "Reheat dehumidification" of air conditioners is drastically decreasing / Continuous operation vs. intermittent operation of air conditioners / Air conditioner selection that is not just about the number of tatami mats / Knowing how to choose from 4 air conditioners / Is it true that Osaka is more humid than Tokyo? 3. Knowing the Strengths and Weaknesses of Windows  Japan, a "window" laggard in the world / Cost-effectiveness of residential sashes is high / Passive design should prioritize the sun over wind 4. Knowing Insulation and Housing Equipment Effective for Renovation  Insulation renovation saves the elderly / Eliminate electric water heaters to save electricity / A loss of 4,000 yen per month with a range hood / Shorten housework time and have a rich life 5. Knowing the Essence of Design  Steps to insulation ~ airtightness ~ passive design / Considering insulation from cost performance and comfort / Passive methods that lead to increased orders / Low-cost houses are more "sun-friendly design" / Reduce unnecessary work with passive design / Build a warm house in winter while keeping costs down