I live in southern California in an area that really doesnt get very cold outside but our house always seems to be cold inside.

The house is about 20 years old. 2-story (upstairs seems colder than downstairs). New double pane windows. We get a constant breeze from the open canyon area behind us.

Who can I call to come out and evaluate what the problems are and offer solutions? A heating/air systems specialist? Insulation specialist?

And/or is there an instrument that I can use in the house to determine where the cold air is coming from?

I appreciate any advice....