Useful Links
Air Conditioning & Heating:
Carrier Corporation
Lennox
The TRANE Company
Preston's Guidebook (lists HVAC Mfgs, models, age, etc)
Heat Exchanger Experts

Asbestos:
EPA (Environmental Protection Agency)

Building Code Information:
Code Check - Help with Building Codes
ICBO (International Conference of Building Officials)
BOCA (Building Officials & Code Administrators)
CABO (Council of American Building Officials)
ICC (International Code Council)

Construction Information:
NAHB (National Assoc. of Home Builders)
This Old House
JLC(Journal of Light Construction)
Simpson Strong-Tie (Metal Connectors Ties)
Fine Homebuilding
Truss Joists for Floors
HomeTime
We Build (good site on construction info)
Home Inspection/Construction Info Website
University of Illinois - Urbana/Champaign
How Stuff in Your Home Works
Do It Yourself Home Repairs
Common Construction Defects and Failures

Consumer Housing Advocates & Hotline:
HADD (Homeowners Against Deficient Dwellings)

Fireplaces & Chimneys:
Chimneys.com
Chimney Venting Information
CSIA (Chimney Safety Institute of America)
NCSG (National Chimney Sweep Guild)

Foundations & Repairs:
Atlas Piers
Basement Moisture Causes & Solutions
Power Lift Foundation Repair

Regulations:
S.C. Department of Labor, Licensing and Regulation
Kaplan Professional

Lead Paint:
EPA(Environmental Protection Agency)

Mold & Fungus:
Stachybotrys (Black Mold)
Mold Testing Information
Toxic Mold
EPA (Environmental Protection Agency) - Should Air Ducts be Cleaned?

Plumbing:
Plumbing Express - Polybutylene Specialists

Radon Gas:
NRSB(National Radon Safety Board)
Air-Check
EPA (Environmental Protection Agency)
RTCA (Radon Testing Corporation of America)

Roofing:
Haag Engineering Company(top notch group)
Cedar Shake & Shingle Bureau
Roofhelp.com (good roofing info site)
ARMA (Asphalt Roofing Manufacturers Assoc)

Sidings (Hardboard and/or Masonite Siding Information):
Home Claim Services.com
Siding Solutions.com
Masonite Claims.com

Stucco & EIFS (Exterior Insulation Finish System):
EDI (Exterior Design Institute)
TLPCA (Texas Lath & Plastering Contractors Association)
Stucco-Pro (Moisture Testing)
Moisture Warranty Corporation
Dryvit
STO Corporation
Parex, Inc.
EIMA (EIFS Industry Manufacturers Association)

Tools & Equipment:
Tool Crib of The North
Professional Equipment