My wife has recommended we change our Series E bonds to HH bonds. What are the consequences of changing to HH bonds? Tom's response Before you decide, read our investment analysis of 1.5% Series HH Savings Bonds to make sure converting makes financial sense in your situation. For most people, converting is a bad idea. If you decide it makes sense to go ahead with the conversion, learn how to convert Series E/EE bonds to HH bonds here. Click here to visit the premier independent web site for Federal Saving Bond owners.