Green Energy Efficiency Questions

My daughter has an older home with what I call "rock wool" insulation in the ceiling and walls. How to better insulate?

— Kenneth Kempf Hillsdale, IL

Danny Kelly

Answered by Danny Kelly

Kelly McArdle Construction

August 30, 2010

Should I go with an air source heat pump or electric radiant floor heat?

— Chris DiGiacomo Shirley, NY

Answered by Rick Goyette on September 1, 2010

My daughter has an older home with what I call "rock wool" insulation in the ceiling and walls. How to better insulate?

— Kenneth Kempf Hillsdale, IL

Answered by Danny Kelly on August 30, 2010

Is it okay to spray open-cell foam over a layer of closed-cell foam?

— Steven L'Heureux Richmond, VA

Answered by Danny Kelly on August 30, 2010

I recently had blown-in cellulose put in my attic. Can I install batt insulation over it to increase the R-value?

— Jon Tyler Bristol, RI

Answered by Danny Kelly on August 30, 2010

What is the best furnace out there?

— Jerry Lawrence Aurora, CO

Answered by Dan Werner on August 26, 2010

I live in an attached house (on both sides). Do I need to insulate my basement?

— DESIREE GARY Saint Albans, NY

Answered by Danny Kelly on August 24, 2010

How do you insulate a home in Michigan that has a cathedral ceiling with exposed beams and no insulation? Roof is shingled.

— Claudia Ruehle Lansing, MI

Answered by Danny Kelly on August 24, 2010

Is there a strong argument for using a bubble insulation or foil product on trusses instead of just a radiant barrier to reduce attic temps?

— Justin Brooks Kernersville, NC

Answered by Danny Kelly on August 24, 2010

NYC has a "cool roof" program. Is there a white paint or coating to make my roof cooler?

— m. todd Hicksville, NY

Answered by Barbara Collins on August 23, 2010

Is there actually less wear and tear on your AC unit if you leave the fan running all the time, due to less stopping and starting?

— Lynn Priest Kelso, TN

Answered by Lee Hall on August 21, 2010

I'd like to be able to flush my tankless water heater to remove scale. What type of circulating pump do I need?

— John W. Olver Pacific Grove, CA

Answered by Evan Little on August 18, 2010

Is it wise to create an airspace between the roof and closed-cell spray foam to allow for venting?

— C. Monte Wardsboro, VT

Answered by Lee Hall on August 13, 2010

What is the greenest, best fireplace replacement?

— Beth Seymour, IN

Answered by Lee Hall on August 13, 2010

I have heard it is most efficient to run the fan constantly for a central air-conditioning unit. Is that correct?

— Rich Chesterfield, MO

Answered by Hamid Kashani - AIA on August 4, 2010

We live in DC, in a home built in the '50s with no insulation and a flat roof. The upstairs gets very hot in summer; any solutions?

— Shizua Oliver Washington, DC

Answered by Hamid Kashani - AIA on August 4, 2010

 

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