Boehmer Heating & Cooling Blog: Archive for the ‘Energy Savings’ Category

What’s the Difference Between a Furnace and a Boiler?

Monday, May 9th, 2011

When it comes time to choose a new heating system for your home, there is a good chance your choices are limited. Most homes already have either forced air or radiant heat equipment installed so choosing something different would be costly and unnecessary. But, if you have a choice or are moving into a new home, here are some things to consider regarding the difference between furnaces and boilers.

What a Furnace Does

A furnace uses a fuel like gas, oil or electricity to heat a series of coils in the device. The furnace then uses a blower to push air across the heated coil and into an air handler where it can be distributed throughout your home. This is called a forced air system and requires a combination of ducts and filters to keep air moving smoothly and cleanly throughout your home.

If you have access to gas, a gas furnace with an AFUE of 90% or higher is one of the most efficient and cost effective ways to heat your home. These furnaces can also last upwards of 20-25 years with proper maintenance.

What a Boiler Does

A boiler is different in that it uses water as the heat carrying medium, not air. Boilers still need gas, oil or electricity to heat up the water in the system, though they often use less of it than a traditional furnace – depending on the age of the furnace and the boiler. After water is heated in the boiler, your radiant heating system carries the water to baseboard heaters or radiators throughout your home. This form of heat is preferred by many because it doesn’t require ductwork (which requires extra maintenance) or extra air filtering and it is more humidity friendly in a large home.

In terms of efficiency, both boilers and furnaces are efficient if you’re buying a new model. Capacity is also evenly matched. Boilers take the edge in comfort level and if you have the budget, you can install radiant floor heating which allows you to pipe hot water directly into bathroom floors or your living space so that you never again need to walk on cold floors. Another benefit of radiant heating is that the system will hold heat much longer and then release it over time instead of turning on and off a lot as a furnace tends to do.

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Why Insulate a Basement

Friday, April 29th, 2011

Especially if your basement is unfinished, you probably do not spend much time down there. And if that is the case, it can be hard to see why you would want to expend the time and money to put in quality insulation in an area of your house that you do not use for much other than storage. But your basement can be costing you a lot if it is not insulated and you probably do not even realize it.

The simple fact is that closing the door to your basement does not summarily cut it off from the rest of your house. The entire floor surface of the first floor of your house is directly connected to the basement and there is a great deal of heat lost through there in the winter. That means that your central heating system will have to work harder to keep the living spaces of your house warm. Plus, the floor will just always be cold.

But putting insulation in your basement can dramatically cut down on the amount of heat you are losing in the winter. Rather than channeling that heat right through your floor and out into the cold soil beyond, an insulated basement will hold the heat and help to keep your first floor warmer. This will reduce your heating costs and it can also cut back on many of the moisture retention problems that basements are so prone to developing.

There are several different ways to insulate a basement and the appropriate one for your situation will depend on a variety of factors. Some insulation needs to be installed on the exterior of the basement walls, but this can be difficult and costly if you are trying to do it on an existing home. Exterior basement insulation usually makes the most sense when you are building a new home.

However, you can still insulate your basement thoroughly with insulation that is installed on the interior of your basement walls. While this may take a few inches of useable space away from you, it will be well worth it in the end.

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Green Thinking for Green Thinkers

Wednesday, April 27th, 2011

There are a lot of media stories about exciting new green buildings: LEED-certified buildings, net-zero buildings, buildings made out of recycled shipping containers, homes in New Urbanist communities, even “ultra-small” homes. But a new home can be pricey. Fortunately, though, all these innovative green ideas can be applied where you live right now. In fact, going green in your existing home might even be better for the environment than building a brand-new home.

If you wish your home could be LEED-accredited, focus on energy conservation and indoor air quality in your existing home. Upgrade to a high-efficiency furnace and air conditioner and consider adding central air filtration to your heating and cooling system. Install Energy Star appliances and WaterSense plumbing fixtures. For remodeling projects, use VOC-free paints and natural materials.

If you wish you had a “net-zero” home, consider geothermal – and insulate. Geothermal systems use 70% renewable energy and protect you against spikes in oil and utility prices. To increase your energy savings still more, tighten the “thermal envelope” of your home by identifying and sealing hidden air leaks and adding insulation.

If you wish you lived in a “recycled” home, get to know your local salvage yard. Many communities have “architectural salvage” shops and recycle/reuse areas in their landfills. When you do your next home improvement project, go shopping at your landfill first. This is not only great for the environment; it’s also great for your budget. Plus, you’ll end up with a creative, unique home. (Of course, make sure that you don’t re-use items containing lead, asbestos, or other contaminants.)

If you wish you lived in a New Urbanist community, start walking and biking in your own community. Experiment with replacing some of your car trips with walking or biking trips. If you find that your community isn’t pedestrian- or bike-friendly, work with local politicians to change this. Learn about your local public transportation options to see if you can fit them into your lifestyle. If you’re in the market for a new home, make location and proximity to work and shops a primary consideration.

If an “ultra-small” home looks like fun but seems impractical as a long-term residence, consider reducing the size of your own living space. If your kids are grown, it may be time to downsize to a smaller home that uses less energy. If you’re building a new home or an addition to your current home, build only what you need. Sometimes the greenest building decision you make can be deciding to build less.

(The “Not So Big House” website (http://www.notsobig.com) is a great resource for those interested in downsizing while maintaining a high quality of life.)

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Changes in Light Bulb Laws and Technology

Wednesday, April 20th, 2011

In 2007, Congress passed the Energy Independence and Security Act, which promoted many forms of renewable energy and energy conservation. Its provisions include changes to the minimum standards for light bulb efficiency. Although the new standards haven’t officially gone into effect yet, you many already have seen changes in the kinds of light bulbs on sale in your local hardware store.

According to the law, starting in 2012, most standard general-purpose bulbs must be 30% more energy efficient than current incandescent bulbs. The new requirements will be phased in gradually, but the net result will be that by 2014, most of today’s incandescent bulbs will no longer be available for sale, and will be replaced by compact florescent light bulbs, or CFLs.

Of course, higher-efficiency bulbs are good for the environment. Moving to more efficient lighting is one of the easiest, lowest-cost ways for the U.S. to reduce electricity use and carbon emissions. But the changes will also benefit consumers – some estimates suggest that the average household’s utility bill will be reduced by as much as 12%. Even though CFLs cost more to buy ($3 compared to 50 cents for an incandescent), they use about 75% less energy and last five years instead of a few months. Depending on the cost of electricity, a homeowner that invests $90 to change 30 bulbs to CFLs will save between $440 and $1500 over the five-year life of the bulbs.

CFLs do have their detractors. Many claim that they don’t last anywhere near as long as the five years claimed by manufacturers – and this can in fact be the case you turn the bulbs on and off frequently. Energy Star recommends that all CFLs be left on for at least 15 minutes at a time. (Also, if you are using the bulbs in a dimmer, make sure that you buy bulbs specifically marked “dimmable”.) If you buy Energy Star bulbs, they come with a two-year warranty, so save your receipts and contact the bulb’s manufacturer if it burns out prematurely.

Others dislike the white – sometimes called “harsh” – light of CFLs. This effect can be mitigated by buying cooler-burning CFLs. Bulbs with Kelvin temperatures in the range of 2,700 to 3,000 emit a warmer light than higher-temperature bulbs with Kelvin temperatures of 5,000 or higher, which tend to have a white or bluish light.

Still other critics point out that CFLs contain mercury. While this is true, incandescent bulbs are not mercury-free in practice either. The increased power used for incandescent likely comes from coal-powered plants that produce mercury and many other types of pollution.

If you do break a CFL in your home, consult the EPA’s website for instructions on how to clean it up safely. http://www.epa.gov/cfl/cflcleanup.html

Of course, manufacturers are preparing for 2012 by developing new kinds of light bulbs that meet the more stringent standards, including high-efficiency incandescent and LED bulbs, so look for these options to arrive in stores over the next year or so.

The good news? A much less-beloved light bulb has already been phased out. The T-12 fluorescent tube – those humming, flickering office lights that give everyone’s skin a miserable greenish cast – has been replaced by T-8 fluorescent tubes, which are quieter, more efficient, don’t flicker, and make colors look much more natural.

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