February 10, 2011
Beat The Cold
I started a new job this year, and unlike my former commute (downstairs) I have to drive. To my utter horror, my mileage dropped below 40MPG after the first few weeks. But I fixed that.
The Prius will normally turn off the engine when the car is stopped, which, for my commute is frequently — many lights, and heavy traffic in some parts. But in the winter, until the car has warmed up, the Prius decides to keep the engine on. Idling in traffic isn’t good.
But, if I turn off the heater, off goes the engine. Ha!
My mileage this week has been back up to normal (a little lower than the normal 50+ MPG in winter — in cold climates they change the fuel mix in winter so cars will run properly, even if less efficiently).
So when the car is moving and the engine is on, I turn on the heater, while slowed or stopped, I turn it off. By 10 or 15 minutes the engine is hot enough that the engine will stop on its own. It takes a little longer to warm up the car, and sometimes you need to turn on the AC to prevent the windshield from fogging up, but otherwise, it’s a pretty good trick.
Photo Credit: kalevkevad via Flickr.
December 6, 2010
My First Attempt: Failure (Blue = Bad)
A while back, I had an energy audit
and found that my house leaked like a sieve
— a condition that left our efforts to insulate, replace windows, replace the gas burner and so on all waiting for me to wake up and smell the … fresh outdoor air.
The audit pointed out where the drafts were. We sealed. We caulked. We foamed. We had all of the identified problems addressed, mostly. And then (as a favor) our energy auditor returned and did a re-test, and found places we had missed. By “we” I mean “I’.
Holey Hole, Batman!
B&D Thermal Leak Detector: 62 Degrees
The whole house fan was one big remaining hole that I proudly asserted having fixed for $20
— I had built a box out of insulating foam board. I had put a nice cover over the fan, box corners sealed with duct tape, and made a nice seal between the cover and the floor. But the follow-up blower-door test showed: it was still
a big hole in the house. By that winter, I knew — I could put my hand up and feel the cool air tumbling down from the attic. For another $8 I fixed the rest of the problem this fall. (more…)
September 21, 2010
Here are a couple of posts I have written elsewhere. Everything you want to know about how (not) to program your thermostat, posted on the Microsoft Hohm blog, and a pretty cool post about an incredibly cool new bit of software for recognizing patterns in electricity use data with pretty pictures and all, called PlotWatt.
I never have time to write here any more :-(
Comments Off on PlotWatt at Energy Circle, and Programmable Thermostats at Hohm
January 23, 2010
A while back, I had started a project of insulating the heating pipes that run through my basement — we have an old house that was designed for a gravity-fed hot water heating system — iron pipes and big old radiators.
Unlike a modern system, using copper pipe that run through baseboard radiators, we have a system that appears to be one step beyond the old steam-heat systems: big, heavy cast-iron radiators that take up a lot of space; and big, heavy cast-iron piping that runs through the basement and upon which I regularly knock my noggin.
Insulating my pipes was, to use an indelicate expression, like pissing in the wind. Or at least it was then. Today, I finished that job. But it took 13 years — insulating my heating pipes was probably the only thing I did that I should have done last. But I am getting ahead of myself. (more…)
Comments Off on How Not To Make an Efficient House in 13 Years
January 22, 2010
In the Spring of 2009 I hired energy auditor Flemming Lund to do an energy audit on our house — I posted pictures and the full report — it was pretty amazing. I had some work done this summer (air sealing and insulation), and did some more on my own this fall — mostly caulking and stuff. Then I asked Flemming to come back and re-do the test. I told him he would have endless fame, fortune and that I would continue to refer customers to him, so he graciously waived the re-audit fee (thanks Flemming!)
And here are the results. Well, actually, the results are on Energy Circle — they have real editors and a wider audience than little ol’ Five Percent, and it was Energy Circle that helped me find Flemming and learn about a lot of this stuff from the start.
I hope you’ll take a minute to pop over and read my story. Our savings from the whole process, from an energy audit, air sealing, insulation, and good old caulk are pretty impressive, if I do say so myself. (more…)
January 18, 2010
A Beginner’s Guide to Home Energy Conservation
by Marcy Tate
Energy conservation is not only good for the planet, it’s also good for your pocket. It’s pretty simple to conserve energy at home and you’ll notice the savings right away. Still, changing your energy habits isn’t easy for every homeowner. Start by picking a few energy conservation techniques and gradually add a few more each month. As you go along, remind yourself how much of a help your efforts are for the planet and how much lower your utility bills will be. That should give you the inspiration to turn your energy conservation habits into a way of life. The tips below do not involve high investments.
October 31, 2009
I expected nothing less of Google PowerMeter — week by week, it continues to improve. Now the graph displays my usage compared to expected use, and includes a visual and numeric accounting of my baseline, “Always On” usage compared to total usage. Here’s what my graph for today looks like:
Three Great Things
The expected usage gives you a nice target, and the comparison to others provides a helpful benchmark.
But the new “Always On” measure provides two very helpful bits of information.
First, the darker bar helps isolate the spikes above. For example, the most obvious repeating spike above is the refrigerator — it cycles on about once per hour and runs for perhaps 25 minutes each time, running at a bit over 200W — it’s easy to see that pattern. (more…)
September 24, 2009
As I have often mentioned in these pages, we had an energy audit last Spring. The audit was a seminal moment in my understanding of our household energy usage.
Mission Accomplished! (Or Is It?)
I talk to a lot of people about their energy conservation measures. Naturally, not wanting to look uncaring, people talk about how they have changed and are going green. Perhaps a light bulb or two changed to CFL. Perhaps they a jacket on their water heater. Some weatherstripping on their door? A programmable thermostat?
These changes sound fine, and they may actually make a difference. But there are two ways that just making changes alone doesn’t really change things.
Perhaps your two CFL bulbs reduce your electrical use a little, but isn’t it important to know how much? (For example, the oft-repeated water heater jacket is of almost no value if you have a relatively newer one). So it’s possible that your changes haven’t improved anything. And the second way changes alone are bad: you may feel like you have “gone green” … mission accomplished.
So to my great chagrin, I realized recently that I had very little clue what my heating usage was, or for that matter what it should be. I had made lots of great changes. Mission accomplished? Not so fast. (more…)
September 21, 2009
In the summer, we use our whole house fan to stay cool — it draws cool, fresh evening air through the house making us comfortable enough that we never used an air conditioner this past summer. Our electricity bill was great.
But now that it’s fall, we might as well call it a “house hole” instead :-)
We have a 32″ square hole in our attic. We had an old mattress cover that was about the right size and we tossed it over the top every fall thinking, “close enough”. Then we had our energy audit last Spring, and this is what we found: the picture on the left is of the louvers that cover the fan opening when it’s not on; the picture on the right is an infrared photo of the same area taken (with our mattress cover installed). Blue is cold, and cold is bad.
Whole House Fan, or House Hole (click for full size image)
You can also see some un-insulated areas along the top of the window, as well as around the fan itself. But that dark blue area is right in the middle.
Blue is bad.
Since the energy audit, we have had the house insulation filled in where the first contractor messed up, and topped off the insulation in the attic. But I still needed to improve on the mattress cover. (more…)
July 25, 2009
After our recent energy audit found drafts in a number of places in our house, and even though the damper was closed, one of the biggest was the chimney — the auditor recommended a “chimney balloon“. It’s a good, simple product, and I can tell that it works beautifully. The maker claims that you can save almost twice it’s cost annually: a good way to reduce heating bills.
The chimney balloon is an inflatable bag, available in various sizes to fit inside your chimney. A tube and valve on the bottom allows you to inflate it so that it conforms to even the roughest, oddest shaped chimney interiors. The inflating tube is detachable, so there’s nothing visible when installed. The balloon is made of a tough, durable plastic. It can be easily removed as needed (but don’t forget to before lighting a fire!) and just as easily reinstalled. The cost is under $50, and their web site has a lot of great and helpful information on how to choose the right size.
I can tell that the chimney balloon works because it has solved an annoying problem for us already this summer (more…)