Landmark Construction Crew has the best energy efficient windows Los Angeles can provide. Installing Energy Efficient Windows is one of the most important energy upgrades that a homeowner can make to their Los Angeles property because windows are responsible for about 30% of all heat loss and gain. By updating your existing windows or completely replacing them with energy efficient windows, you’ll be saving energy and money. There are many options to choose from such as vinyl windows, fiberglass windows, double-pane windows, triple-pane windows or wood windows and it’s all dependent on what you prefer and which ones make sense for your type of building. Energy Efficient Window installation by Landmark Construction Crew has a number of benefits.