As far as I know, in all states, you have the right to enter and make emergency repairs without any advance notice. It must be an emergency where the property will be damaged if immediate steps are not taken. It sounds as if you qualify. If the tenants are hostile, you may want to request a police officer to escort you. That is better than going alone and having an altercation with no officers present as witnesses.
Most standard rental contracts and leases at least allow for entry with 24 hours notice regardless of circumstances. This is an advisement that you will be entering, not a request for permission to enter.
Tenants do have some rights, which vary by location. They do NOT have the right to prevent you from making needed repairs to avoid damage to the property.
Captain Joe Redcloud