Home Automation Design and Installation
Home automation design and installation can run the gamut from extremely simple, DIY projects to highly complex systems that require expert-level knowledge of electrical engineering and computer software and hardware. Depending on your home automation needs, you may be able to set up a simple home automation system on your own, or you may decide to choose from a number of manufacturers for individual home automation systems or whole-house systems.
Before you replace windows and doors, insulate the attic or install new siding, find out exactly where the home is leaking energy and dollars. The best way to do this is to get a home energy audit-- an evaluation of your home's energy performance. Energy audits generally cost between $250 and $350, depending on how long it takes for the energy auditor, or rater, to get to your home.
Jeff meets with the energy auditor
Jeff Wilson paid $350 for a Home Energy Rating System (HERS) audit, which is administered by the Residential Energy Services Network (RESNET). RESNET trains HERS raters to evaluate the energy efficiency of your home, and they come prepared with tools to help you decide where to start making repairs. "The nice thing about a HERS rating is that it gives you a cost-benefit analysis so you can make better decisions," Wilson says. Wilson learned he might as well be leaving a window wide open, year-round. That's how much air was passing through all of the leaky joints and weak walls and windows of his home. It didn't help that when he knocked out a knee-wall in his kids' bedroom to construct a built-in bookcase, he didn't properly seal the area. A daylong visit from the HERS rater covered every mechanical aspect of the home (HVAC, appliances, lighting) and its envelope (windows, doors, insulation, roof). The rater conducted a blower door test to assess the leakiness of the house, and a duct test to locate leaks in the HVAC duct system. He checked electrical outlets -- for, yes, more leaks -- and compiled all this information into a handy report with charts.
Jeff Knocks a Hole in the Kids' Bedroom Wall
Wilson learned he might as well be leaving a window wide open, year-round. That's how much air was passing through all of the leaky joints and weak walls and windows of his home. He didn't know it at the time, but he had made matters worse when he knocked out a knee-wall in his kids' bedroom to construct a built-in bookcase (as seen in this picture). That's because he didn't properly seal the area afterwards.
Diagnosing the House
Here are some highlights of Wilson's HERS test, what the rater determined about the home's efficiency, and what you might experience if you enlist a HERS auditor. Blower door test: A fan mounted inside the doorway is connected to a digital pressure meter. This way, it can measure any air escaping or entering the home. This is how Wilson learned that his home's "holes" amounted to 160 square inches of total open space—a sizeable gap. Infrared imaging: Wilson got his HERS test in the summer, so the rater used an infrared camera to show where heat was leaking into the air-conditioned home. Humidity is a problem in his region, and the reason most people crank up the A.C. during summer weather, Wilson says. So keeping humidity out can reduce energy use to keep the home "cool," when really the A.C. is mostly removing moisture from the air. Electric outlet tests: By testing individual switch plates, Wilson learned that their recessed lighting is an energy suck.
The HERS rater collected data from tests and, using a software program, compiled a detailed report to help Wilson understand exactly where his home stood on the efficiency spectrum. The Wilsons scored an 87 HERS rating, with 100 being the HERS baseline. Higher than 100 means a home is relatively inefficient; a score of zero means the home uses only the energy it creates, such as through solar or wind power. Wilson wasn't disappointed with his score, 87, but with a goal of net-zero, he has a long way to go with his Deep Energy Retrofit (DER) plan.
Energy Star Insulation
Interested in making energy efficient upgrades, but don't know where to start? Many municipalities and utility companies offer rebates or free energy audits under a variety of programs. Search www.dsireusa.org, the Database of State Incentives for Renewables & Efficiency, to find out where these programs are available. You'll find a map where you can search your area for HERS rating or other energy audit offerings. RESNET also administers online home energy surveys. "There is so much conflicting information about the best, least-expensive solutions, what homeowners should do, what contractors should do," Wilson says. "By checking incentives, you can find out which items on your HERS list you could do at a vastly reduced rate right now."
Maximize Your Audit
Wilson suggests these tips for making the most of a HERS test:
- Monitor your home energy use before the HERS test, preferably up to 6 months in advance. This gives you historical data to provide the rater.
- Be at home during the audit so you can discuss your goals with the rater.
- Ask lots of questions during the process.
- Request a range of testing information, from the actual energy use data to solid steps you can take in the short-, medium- and long-term to tighten up your house.
Wilson's rater used a thermal image camera to check the heat leakage around the recessed light in the top of the cabinet in the main bathroom. Wilson learned that recessed lighting can be one of the worst culprits in air leakage into unconditioned space and is correcting it as part of his DER. The Wilsons will have another HERS rating done in early winter to determine how effective their DER was in eliminating leaks. Their goal is to get a score of zero.
Before you decide on the way forward, you'll want to choose which features of home automation are most important to you. In general, the primary categories of home automation are security, HVAC (heating and air conditioning), energy usage monitoring and control, lighting, entertainment, and outdoor sprinkler systems. For homeowners who are interested in controlling all of a home's systems, many manufacturers now offer products that connect to a home's electrical grid and wireless network and control all of these systems via an in-home hub and, in many cases, a digital dashboard accessible via computers and wireless devices from anywhere with an internet connection.
The simplest home automation design and installation approach is to use plug-in automation control. This design involves small control hub boxes that plug into wall sockets and then communicate with appliances and lighting to determine when they'll turn on and off. Homeowners can also control entire rooms or areas of the home via these hubs using a remote control, and in some cases, the boxes can pair with a home's wireless network and be controlled and programmed via a computer, smartphone or other wireless device.
Similarly, smart thermostats are in-home hubs for automated control of the home's heating and air conditioning. They can be programmed by homeowners to operate the HVAC systems at opportune times, reduce or increase temperatures on a set schedule, and even communicate with power companies to provide energy usage information, which can then be relayed back to the consumer with recommendations for efficient use of appliances and heating and air conditioning systems.
Finally, whole-home automation systems are the most complex and difficult to design and install, but they may also provide the greatest benefits in terms of efficiency, cost and energy savings, and convenience. Modern whole-house automation systems almost exclusively operate by connecting to a home's electrical grid and wireless network, allowing the homeowner to control all of the home's systems via computer or wireless device, at the click of a mouse, or the tap of a finger from anywhere in the world with an internet connection.
Whole-home systems are generally designed and installed by companies that manufacture and sell home automation systems, but a growing number of DIY home automation enthusiasts have begun to design and install their own systems. It's important to note that complex home automation installations almost always require expert knowledge of electrical engineering and computer software and hardware. Those homeowners with the desire and technical chops to take on a whole home automation system will find a treasure trove of information on the topic waiting for them, though—many in the DIY community have meticulously documented their automation projects on blogs and websites.
See Also: How to Plan a Home Control System